51245998648 has 16 divisors (see below), whose sum is σ = 103477497480. Its totient is φ = 23651999328.

The previous prime is 51245998627. The next prime is 51245998663. The reversal of 51245998648 is 84689954215.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246374890 + ... + 246375097.

Almost surely, 2^51245998648 is an apocalyptic number.

It is an amenable number.

51245998648 is an abundant number, since it is smaller than the sum of its proper divisors (52231498832).

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

51245998648 is a wasteful number, since it uses less digits than its factorization.

51245998648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492750006 (or 492750002 counting only the distinct ones).

The product of its digits is 24883200, while the sum is 61.

The spelling of 51245998648 in words is "fifty-one billion, two hundred forty-five million, nine hundred ninety-eight thousand, six hundred forty-eight".