51404416621 has 16 divisors (see below), whose sum is σ = 54609168384. Its totient is φ = 48219963904.

The previous prime is 51404416601. The next prime is 51404416649. The reversal of 51404416621 is 12661440415.

It is a cyclic number.

It is not a de Polignac number, because 51404416621 - 2¹⁷ = 51404285549 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 (51404416601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18079626 + ... + 18082468.

It is an arithmetic number, because the mean of its divisors is an integer number (3413073024).

Almost surely, 2^51404416621 is an apocalyptic number.

It is an amenable number.

51404416621 is a deficient number, since it is larger than the sum of its proper divisors (3204751763).

51404416621 is a wasteful number, since it uses less digits than its factorization.

51404416621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6020.

The product of its (nonzero) digits is 23040, while the sum is 34.

The spelling of 51404416621 in words is "fifty-one billion, four hundred four million, four hundred sixteen thousand, six hundred twenty-one".