51636643610 has 16 divisors (see below), whose sum is σ = 93002081256. Its totient is φ = 20642185728.

The previous prime is 51636643567. The next prime is 51636643613. The reversal of 51636643610 is 1634663615.

It can be written as a sum of positive squares in 4 ways, for example, as 47638737169 + 3997906441 = 218263^2 + 63229^2 .

It is not an unprimeable number, because it can be changed into a prime (51636643613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1541567 + ... + 1574706.

Almost surely, 2^51636643610 is an apocalyptic number.

51636643610 is a deficient number, since it is larger than the sum of its proper divisors (41365437646).

51636643610 is a wasteful number, since it uses less digits than its factorization.

51636643610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3117937.

The product of its (nonzero) digits is 233280, while the sum is 41.

The spelling of 51636643610 in words is "fifty-one billion, six hundred thirty-six million, six hundred forty-three thousand, six hundred ten".