51566278761 has 24 divisors (see below), whose sum is σ = 75536094816. Its totient is φ = 33893919360.

The previous prime is 51566278741. The next prime is 51566278831. The reversal of 51566278761 is 16787266515.

It is a happy number.

51566278761 is a `hidden beast` number, since 5 + 1 + 5 + 6 + 627 + 8 + 7 + 6 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-51566278761 is a prime.

It is a super-2 number, since 2×51566278761² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51566278698 and 51566278707.

It is not an unprimeable number, because it can be changed into a prime (51566278741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 296481 + ... + 437073.

It is an arithmetic number, because the mean of its divisors is an integer number (3147337284).

Almost surely, 2^51566278761 is an apocalyptic number.

It is an amenable number.

51566278761 is a deficient number, since it is larger than the sum of its proper divisors (23969816055).

51566278761 is a wasteful number, since it uses less digits than its factorization.

51566278761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141173 (or 141170 counting only the distinct ones).

The product of its digits is 4233600, while the sum is 54.

The spelling of 51566278761 in words is "fifty-one billion, five hundred sixty-six million, two hundred seventy-eight thousand, seven hundred sixty-one".