51183316621 has 8 divisors (see below), whose sum is σ = 51266045600. Its totient is φ = 51100625520.

The previous prime is 51183316601. The next prime is 51183316693. The reversal of 51183316621 is 12661338115.

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 51183316621 - 2⁵ = 51183316589 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 (51183316601) 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, 3998251 + ... + 4011031.

It is an arithmetic number, because the mean of its divisors is an integer number (6408255700).

Almost surely, 2^51183316621 is an apocalyptic number.

It is an amenable number.

51183316621 is a deficient number, since it is larger than the sum of its proper divisors (82728979).

51183316621 is a wasteful number, since it uses less digits than its factorization.

51183316621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18939.

The product of its digits is 25920, while the sum is 37.

The spelling of 51183316621 in words is "fifty-one billion, one hundred eighty-three million, three hundred sixteen thousand, six hundred twenty-one".