51861863824 has 75 divisors (see below), whose sum is σ = 107307125797. Its totient is φ = 24281696768.

The previous prime is 51861863803. The next prime is 51861863863. The reversal of 51861863824 is 42836816815.

It is a happy number.

The square root of 51861863824 is 227732.

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

It can be written as a sum of positive squares in 7 ways, for example, as 9741690000 + 42120173824 = 98700^2 + 205232^2 .

It is a Duffinian number.

Its product of digits (2211840) is a multiple of the sum of its prime divisors (216).

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 263258094 + ... + 263258290.

Almost surely, 2^51861863824 is an apocalyptic number.

51861863824 is the 227732-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51861863824

51861863824 is an abundant number, since it is smaller than the sum of its proper divisors (55445261973).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51861863824 is an frugal number, since it uses more digits than its factorization.

51861863824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470 (or 216 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 52.

The spelling of 51861863824 in words is "fifty-one billion, eight hundred sixty-one million, eight hundred sixty-three thousand, eight hundred twenty-four".