51615515532611 has 4 divisors (see below), whose sum is σ = 52268876488800. Its totient is φ = 50962154576424.

The previous prime is 51615515532601. The next prime is 51615515532613. The reversal of 51615515532611 is 11623551551615.

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 51615515532611 - 2¹⁸ = 51615515270467 is a prime.

It is a super-2 number, since 2×51615515532611² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51615515532613) 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, 326680477976 + ... + 326680478133.

It is an arithmetic number, because the mean of its divisors is an integer number (13067219122200).

Almost surely, 2^{51615515532611} is an apocalyptic number.

51615515532611 is a deficient number, since it is larger than the sum of its proper divisors (653360956189).

51615515532611 is an equidigital number, since it uses as much as digits as its factorization.

51615515532611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653360956188.

The product of its digits is 675000, while the sum is 47.

The spelling of 51615515532611 in words is "fifty-one trillion, six hundred fifteen billion, five hundred fifteen million, five hundred thirty-two thousand, six hundred eleven".