51979749255 has 48 divisors (see below), whose sum is σ = 106291021824. Its totient is φ = 22995645120.

The previous prime is 51979749247. The next prime is 51979749271. The reversal of 51979749255 is 55294797915.

51979749255 is a `hidden beast` number, since 5 + 1 + 9 + 7 + 97 + 492 + 55 = 666.

It is not a de Polignac number, because 51979749255 - 2³ = 51979749247 is a prime.

It is a super-2 number, since 2×51979749255² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 51979749192 and 51979749201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2651769 + ... + 2671298.

It is an arithmetic number, because the mean of its divisors is an integer number (2214396288).

Almost surely, 2^51979749255 is an apocalyptic number.

51979749255 is an abundant number, since it is smaller than the sum of its proper divisors (54311272569).

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

51979749255 is a wasteful number, since it uses less digits than its factorization.

51979749255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5323116 (or 5323113 counting only the distinct ones).

The product of its digits is 35721000, while the sum is 63.

The spelling of 51979749255 in words is "fifty-one billion, nine hundred seventy-nine million, seven hundred forty-nine thousand, two hundred fifty-five".