661320462 has 64 divisors (see below), whose sum is σ = 1489653504. Its totient is φ = 193962240.

The previous prime is 661320433. The next prime is 661320469. The reversal of 661320462 is 264023166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661320469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 553738 + ... + 554930.

It is an arithmetic number, because the mean of its divisors is an integer number (23275836).

Almost surely, 2^661320462 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661320462, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (744826752).

661320462 is an abundant number, since it is smaller than the sum of its proper divisors (828333042).

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

661320462 is a wasteful number, since it uses less digits than its factorization.

661320462 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1473.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 661320462 is about 25716.1517727672. The cubic root of 661320462 is about 871.2390246499.

It can be divided in two parts, 661 and 320462, that added together give a palindrome (321123).

The spelling of 661320462 in words is "six hundred sixty-one million, three hundred twenty thousand, four hundred sixty-two".