661296052 has 24 divisors (see below), whose sum is σ = 1207877832. Its totient is φ = 316492800.

The previous prime is 661296049. The next prime is 661296067. The reversal of 661296052 is 250692166.

It can be written as a sum of positive squares in 4 ways, for example, as 5731236 + 655564816 = 2394^2 + 25604^2 .

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29349 + ... + 46732.

It is an arithmetic number, because the mean of its divisors is an integer number (50328243).

Almost surely, 2^661296052 is an apocalyptic number.

It is an amenable number.

661296052 is a deficient number, since it is larger than the sum of its proper divisors (546581780).

661296052 is a wasteful number, since it uses less digits than its factorization.

661296052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76179 (or 76177 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 661296052 is about 25715.6771639403. The cubic root of 661296052 is about 871.2283050833.

The spelling of 661296052 in words is "six hundred sixty-one million, two hundred ninety-six thousand, fifty-two".