661149108 has 96 divisors (see below), whose sum is σ = 1859397120. Its totient is φ = 202337280.

The previous prime is 661149031. The next prime is 661149109. The reversal of 661149108 is 801941166.

It is a happy number.

661149108 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661149109) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 70885 + ... + 79667.

It is an arithmetic number, because the mean of its divisors is an integer number (19368720).

Almost surely, 2^661149108 is an apocalyptic number.

661149108 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661149108, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (929698560).

661149108 is an abundant number, since it is smaller than the sum of its proper divisors (1198248012).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661149108 is a wasteful number, since it uses less digits than its factorization.

661149108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8854 (or 8846 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 661149108 is about 25712.8199153652. The cubic root of 661149108 is about 871.1637695624.

It can be divided in two parts, 661 and 149108, that added together give a square (149769 = 387²).

The spelling of 661149108 in words is "six hundred sixty-one million, one hundred forty-nine thousand, one hundred eight".