51008532778 has 32 divisors (see below), whose sum is σ = 90695795328. Its totient is φ = 21059352000.

The previous prime is 51008532737. The next prime is 51008532781. The reversal of 51008532778 is 87723580015.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 435168 + ... + 539803.

It is an arithmetic number, because the mean of its divisors is an integer number (2834243604).

Almost surely, 2^51008532778 is an apocalyptic number.

51008532778 is a deficient number, since it is larger than the sum of its proper divisors (39687262550).

51008532778 is a wasteful number, since it uses less digits than its factorization.

51008532778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 975118.

The product of its (nonzero) digits is 470400, while the sum is 46.

The spelling of 51008532778 in words is "fifty-one billion, eight million, five hundred thirty-two thousand, seven hundred seventy-eight".