661031352 has 96 divisors (see below), whose sum is σ = 1873822080. Its totient is φ = 210263040.

The previous prime is 661031351. The next prime is 661031353. The reversal of 661031352 is 253130166.

661031352 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (661031351) and next prime (661031353).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661031351) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 160908 + ... + 164964.

It is an arithmetic number, because the mean of its divisors is an integer number (19518980).

Almost surely, 2^661031352 is an apocalyptic number.

661031352 is a gapful number since it is divisible by the number (62) 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 661031352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (936911040).

661031352 is an abundant number, since it is smaller than the sum of its proper divisors (1212790728).

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

661031352 is a wasteful number, since it uses less digits than its factorization.

661031352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4173 (or 4166 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 661031352 is about 25710.5299828689. The cubic root of 661031352 is about 871.1120460552.

The spelling of 661031352 in words is "six hundred sixty-one million, thirty-one thousand, three hundred fifty-two".