51637968554 has 48 divisors (see below), whose sum is σ = 85211077248. Its totient is φ = 23377570944.

The previous prime is 51637968553. The next prime is 51637968581. The reversal of 51637968554 is 45586973615.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a junction number, because it is equal to n+sod(n) for n = 51637968493 and 51637968502.

It is not an unprimeable number, because it can be changed into a prime (51637968553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5557997 + ... + 5567279.

It is an arithmetic number, because the mean of its divisors is an integer number (1775230776).

Almost surely, 2^51637968554 is an apocalyptic number.

51637968554 is a deficient number, since it is larger than the sum of its proper divisors (33573108694).

51637968554 is a wasteful number, since it uses less digits than its factorization.

51637968554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9467 (or 9408 counting only the distinct ones).

The product of its digits is 27216000, while the sum is 59.

The spelling of 51637968554 in words is "fifty-one billion, six hundred thirty-seven million, nine hundred sixty-eight thousand, five hundred fifty-four".