61553660 has 48 divisors (see below), whose sum is σ = 152832960. Its totient is φ = 20375040.

The previous prime is 61553627. The next prime is 61553671. The reversal of 61553660 is 6635516.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3521 + ... + 11640.

It is an arithmetic number, because the mean of its divisors is an integer number (3184020).

Almost surely, 2^61553660 is an apocalyptic number.

It is an amenable number.

61553660 is an abundant number, since it is smaller than the sum of its proper divisors (91279300).

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

61553660 is a wasteful number, since it uses less digits than its factorization.

61553660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15206 (or 15204 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 61553660 is about 7845.6140613721. The cubic root of 61553660 is about 394.8371063636.

The spelling of 61553660 in words is "sixty-one million, five hundred fifty-three thousand, six hundred sixty".