51578116826 has 8 divisors (see below), whose sum is σ = 77503147380. Its totient is φ = 25743734368.

The previous prime is 51578116819. The next prime is 51578116829. The reversal of 51578116826 is 62861187515.

It can be written as a sum of positive squares in 2 ways, for example, as 49706256601 + 1871860225 = 222949^2 + 43265^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (51578116829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22660601 + ... + 22662876.

Almost surely, 2^51578116826 is an apocalyptic number.

51578116826 is a deficient number, since it is larger than the sum of its proper divisors (25925030554).

51578116826 is a wasteful number, since it uses less digits than its factorization.

51578116826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45324048.

The product of its digits is 806400, while the sum is 50.

The spelling of 51578116826 in words is "fifty-one billion, five hundred seventy-eight million, one hundred sixteen thousand, eight hundred twenty-six".