51660742855636 has 24 divisors (see below), whose sum is σ = 90603965612160. Its totient is φ = 25773900516672.

The previous prime is 51660742855619. The next prime is 51660742855637. The reversal of 51660742855636 is 63655824706615.

It is a happy number.

It is a super-2 number, since 2×51660742855636² (a number of 28 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (64) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51660742855637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41678856 + ... + 42900448.

It is an arithmetic number, because the mean of its divisors is an integer number (3775165233840).

Almost surely, 2^{51660742855636} is an apocalyptic number.

It is an amenable number.

51660742855636 is a deficient number, since it is larger than the sum of its proper divisors (38943222756524).

51660742855636 is a wasteful number, since it uses less digits than its factorization.

51660742855636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244703 (or 1244701 counting only the distinct ones).

The product of its (nonzero) digits is 217728000, while the sum is 64.

The spelling of 51660742855636 in words is "fifty-one trillion, six hundred sixty billion, seven hundred forty-two million, eight hundred fifty-five thousand, six hundred thirty-six".