51515641048 has 8 divisors (see below), whose sum is σ = 96591826980. Its totient is φ = 25757820520.

The previous prime is 51515641027. The next prime is 51515641061. The reversal of 51515641048 is 84014651515.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×51515641048² (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 51515641048.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3219727558 + ... + 3219727573.

Almost surely, 2^51515641048 is an apocalyptic number.

It is an amenable number.

51515641048 is a deficient number, since it is larger than the sum of its proper divisors (45076185932).

51515641048 is a wasteful number, since it uses less digits than its factorization.

51515641048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6439455137 (or 6439455133 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 40.

The spelling of 51515641048 in words is "fifty-one billion, five hundred fifteen million, six hundred forty-one thousand, forty-eight".