51501565654 has 48 divisors (see below), whose sum is σ = 102752816544. Its totient is φ = 18885208320.

The previous prime is 51501565651. The next prime is 51501565657. The reversal of 51501565654 is 45656510515.

It is an interprime number because it is at equal distance from previous prime (51501565651) and next prime (51501565657).

It is a super-2 number, since 2×51501565654² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51501565654.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51501565651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 865389 + ... + 922984.

It is an arithmetic number, because the mean of its divisors is an integer number (2140683678).

Almost surely, 2^51501565654 is an apocalyptic number.

51501565654 is a deficient number, since it is larger than the sum of its proper divisors (51251250890).

51501565654 is a wasteful number, since it uses less digits than its factorization.

51501565654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1788421 (or 1788410 counting only the distinct ones).

The product of its (nonzero) digits is 450000, while the sum is 43.

The spelling of 51501565654 in words is "fifty-one billion, five hundred one million, five hundred sixty-five thousand, six hundred fifty-four".