51183632644 has 81 divisors (see below), whose sum is σ = 95944326303. Its totient is φ = 23890732800.

The previous prime is 51183632639. The next prime is 51183632663. The reversal of 51183632644 is 44623638115.

The square root of 51183632644 is 226238.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 31200983044 + 19982649600 = 176638^2 + 141360^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51183632644.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 575096952 + ... + 575097040.

Almost surely, 2^51183632644 is an apocalyptic number.

51183632644 is the 226238-th square number.

It is an amenable number.

51183632644 is a deficient number, since it is larger than the sum of its proper divisors (44760693659).

51183632644 is an equidigital number, since it uses as much as digits as its factorization.

51183632644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326 (or 163 counting only the distinct ones).

The product of its digits is 414720, while the sum is 43.

The spelling of 51183632644 in words is "fifty-one billion, one hundred eighty-three million, six hundred thirty-two thousand, six hundred forty-four".