51000400015 has 4 divisors (see below), whose sum is σ = 61200480024. Its totient is φ = 40800320008.

The previous prime is 51000399979. The next prime is 51000400019.

It is a happy number.

51000400015 is nontrivially palindromic in base 10.

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 51000400015 - 2¹¹ = 51000397967 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 (51000400019) 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 3 ways as a sum of consecutive naturals, for example, 5100039997 + ... + 5100040006.

It is an arithmetic number, because the mean of its divisors is an integer number (15300120006).

Almost surely, 2^51000400015 is an apocalyptic number.

51000400015 is a deficient number, since it is larger than the sum of its proper divisors (10200080009).

51000400015 is a wasteful number, since it uses less digits than its factorization.

51000400015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10200080008.

The product of its (nonzero) digits is 100, while the sum is 16.

The spelling of 51000400015 in words is "fifty-one billion, four hundred thousand, fifteen".