51615060555561 has 4 divisors (see below), whose sum is σ = 68820080740752. Its totient is φ = 34410040370372.

The previous prime is 51615060555497. The next prime is 51615060555571. The reversal of 51615060555561 is 16555506051615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51615060555561 - 2⁶ = 51615060555497 is a prime.

It is a super-2 number, since 2×51615060555561² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51615060555571) 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, 8602510092591 + ... + 8602510092596.

It is an arithmetic number, because the mean of its divisors is an integer number (17205020185188).

Almost surely, 2^{51615060555561} is an apocalyptic number.

It is an amenable number.

51615060555561 is a deficient number, since it is larger than the sum of its proper divisors (17205020185191).

51615060555561 is a wasteful number, since it uses less digits than its factorization.

51615060555561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17205020185190.

The product of its (nonzero) digits is 3375000, while the sum is 51.

The spelling of 51615060555561 in words is "fifty-one trillion, six hundred fifteen billion, sixty million, five hundred fifty-five thousand, five hundred sixty-one".