51164540021 has 8 divisors (see below), whose sum is σ = 59041467264. Its totient is φ = 43429539600.

The previous prime is 51164539999. The next prime is 51164540071. The reversal of 51164540021 is 12004546115.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51164540021 - 2²⁶ = 51097431157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51164540071) 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, 35480930 + ... + 35482371.

It is an arithmetic number, because the mean of its divisors is an integer number (7380183408).

Almost surely, 2^51164540021 is an apocalyptic number.

It is an amenable number.

51164540021 is a deficient number, since it is larger than the sum of its proper divisors (7876927243).

51164540021 is a wasteful number, since it uses less digits than its factorization.

51164540021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70963411.

The product of its (nonzero) digits is 4800, while the sum is 29.

The spelling of 51164540021 in words is "fifty-one billion, one hundred sixty-four million, five hundred forty thousand, twenty-one".