51206678440 has 16 divisors (see below), whose sum is σ = 115215026580. Its totient is φ = 20482671360.

The previous prime is 51206678431. The next prime is 51206678473. The reversal of 51206678440 is 4487660215.

It can be written as a sum of positive squares in 2 ways, for example, as 43303112836 + 7903565604 = 208094^2 + 88902^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 640083441 + ... + 640083520.

Almost surely, 2^51206678440 is an apocalyptic number.

It is an amenable number.

51206678440 is an abundant number, since it is smaller than the sum of its proper divisors (64008348140).

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

51206678440 is a wasteful number, since it uses less digits than its factorization.

51206678440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280166972 (or 1280166968 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 43.

The spelling of 51206678440 in words is "fifty-one billion, two hundred six million, six hundred seventy-eight thousand, four hundred forty".