661545336062524 has 24 divisors (see below), whose sum is σ = 1184629423380480. Its totient is φ = 323079808974384.

The previous prime is 661545336062491. The next prime is 661545336062563. The reversal of 661545336062524 is 425260633545166.

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, 135039147 + ... + 139852285.

It is an arithmetic number, because the mean of its divisors is an integer number (49359559307520).

Almost surely, 2^{661545336062524} is an apocalyptic number.

It is an amenable number.

661545336062524 is a deficient number, since it is larger than the sum of its proper divisors (523084087317956).

661545336062524 is a wasteful number, since it uses less digits than its factorization.

661545336062524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5612289 (or 5612287 counting only the distinct ones).

The product of its (nonzero) digits is 93312000, while the sum is 58.

The spelling of 661545336062524 in words is "six hundred sixty-one trillion, five hundred forty-five billion, three hundred thirty-six million, sixty-two thousand, five hundred twenty-four".