51664591224 has 96 divisors (see below), whose sum is σ = 142908105600. Its totient is φ = 16855937280.

The previous prime is 51664591201. The next prime is 51664591291. The reversal of 51664591224 is 42219546615.

51664591224 is a `hidden beast` number, since 5 + 166 + 459 + 12 + 24 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 51664591224.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1590457 + ... + 1622615.

It is an arithmetic number, because the mean of its divisors is an integer number (1488626100).

Almost surely, 2^51664591224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51664591224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71454052800).

51664591224 is an abundant number, since it is smaller than the sum of its proper divisors (91243514376).

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

51664591224 is a wasteful number, since it uses less digits than its factorization.

51664591224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32645 (or 32638 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The spelling of 51664591224 in words is "fifty-one billion, six hundred sixty-four million, five hundred ninety-one thousand, two hundred twenty-four".