51011654642 has 16 divisors (see below), whose sum is σ = 82409647320. Its totient is φ = 23542067712.

The previous prime is 51011654581. The next prime is 51011654663. The reversal of 51011654642 is 24645611015.

It can be written as a sum of positive squares in 4 ways, for example, as 20589667081 + 30421987561 = 143491^2 + 174419^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 317084 + ... + 450072.

Almost surely, 2^51011654642 is an apocalyptic number.

51011654642 is a deficient number, since it is larger than the sum of its proper divisors (31397992678).

51011654642 is a wasteful number, since it uses less digits than its factorization.

51011654642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147757.

The product of its (nonzero) digits is 28800, while the sum is 35.

The spelling of 51011654642 in words is "fifty-one billion, eleven million, six hundred fifty-four thousand, six hundred forty-two".