51162798921 has 8 divisors (see below), whose sum is σ = 73464531840. Its totient is φ = 31484799312.

The previous prime is 51162798917. The next prime is 51162798923. The reversal of 51162798921 is 12989726115.

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

It is not a de Polignac number, because 51162798921 - 2² = 51162798917 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (51162798923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 655933281 + ... + 655933358.

It is an arithmetic number, because the mean of its divisors is an integer number (9183066480).

Almost surely, 2^51162798921 is an apocalyptic number.

It is an amenable number.

51162798921 is a deficient number, since it is larger than the sum of its proper divisors (22301732919).

51162798921 is a wasteful number, since it uses less digits than its factorization.

51162798921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311866655.

The product of its digits is 544320, while the sum is 51.

The spelling of 51162798921 in words is "fifty-one billion, one hundred sixty-two million, seven hundred ninety-eight thousand, nine hundred twenty-one".