51978943551 has 16 divisors (see below), whose sum is σ = 71005713408. Its totient is φ = 33802641600.

The previous prime is 51978943531. The next prime is 51978943561. The reversal of 51978943551 is 15534987915.

It is not a de Polignac number, because 51978943551 - 2⁵ = 51978943519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51978943491 and 51978943500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51978943531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 976146 + ... + 1028016.

It is an arithmetic number, because the mean of its divisors is an integer number (4437857088).

Almost surely, 2^51978943551 is an apocalyptic number.

51978943551 is a deficient number, since it is larger than the sum of its proper divisors (19026769857).

51978943551 is a wasteful number, since it uses less digits than its factorization.

51978943551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60062.

The product of its digits is 6804000, while the sum is 57.

The spelling of 51978943551 in words is "fifty-one billion, nine hundred seventy-eight million, nine hundred forty-three thousand, five hundred fifty-one".