51566066604 has 72 divisors (see below), whose sum is σ = 140487394320. Its totient is φ = 15853698432.

The previous prime is 51566066597. The next prime is 51566066621. The reversal of 51566066604 is 40666066515.

It is a self number, because there is not a number n which added to its sum of digits gives 51566066604.

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, 545454 + ... + 632970.

It is an arithmetic number, because the mean of its divisors is an integer number (1951213810).

Almost surely, 2^51566066604 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 51566066604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70243697160).

51566066604 is an abundant number, since it is smaller than the sum of its proper divisors (88921327716).

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

51566066604 is a wasteful number, since it uses less digits than its factorization.

51566066604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88799 (or 88794 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 51566066604 in words is "fifty-one billion, five hundred sixty-six million, sixty-six thousand, six hundred four".