51621012167 has 4 divisors (see below), whose sum is σ = 53016174696. Its totient is φ = 50225849640.

The previous prime is 51621012137. The next prime is 51621012181. The reversal of 51621012167 is 76121012615.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51621012167 - 2¹² = 51621008071 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 (51621012137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 697581209 + ... + 697581282.

It is an arithmetic number, because the mean of its divisors is an integer number (13254043674).

Almost surely, 2^51621012167 is an apocalyptic number.

51621012167 is a deficient number, since it is larger than the sum of its proper divisors (1395162529).

51621012167 is a wasteful number, since it uses less digits than its factorization.

51621012167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395162528.

The product of its (nonzero) digits is 5040, while the sum is 32.

The spelling of 51621012167 in words is "fifty-one billion, six hundred twenty-one million, twelve thousand, one hundred sixty-seven".