51664189696 has 72 divisors (see below), whose sum is σ = 120082906944. Its totient is φ = 21723985920.

The previous prime is 51664189693. The next prime is 51664189699. The reversal of 51664189696 is 69698146615.

It is an interprime number because it is at equal distance from previous prime (51664189693) and next prime (51664189699).

It is not an unprimeable number, because it can be changed into a prime (51664189693) 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, 177010 + ... + 366961.

It is an arithmetic number, because the mean of its divisors is an integer number (1667818152).

Almost surely, 2^51664189696 is an apocalyptic number.

51664189696 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

51664189696 is an abundant number, since it is smaller than the sum of its proper divisors (68418717248).

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

51664189696 is an equidigital number, since it uses as much as digits as its factorization.

51664189696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544047 (or 544033 counting only the distinct ones).

The product of its digits is 16796160, while the sum is 61.

The spelling of 51664189696 in words is "fifty-one billion, six hundred sixty-four million, one hundred eighty-nine thousand, six hundred ninety-six".