15561464503951 has 2 divisors, whose sum is σ = 15561464503952. Its totient is φ = 15561464503950.

The previous prime is 15561464503933. The next prime is 15561464504021. The reversal of 15561464503951 is 15930546416551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15561464503951 - 2¹¹ = 15561464501903 is a prime.

It is a super-2 number, since 2×15561464503951² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 15561464503892 and 15561464503901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15561464503451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7780732251975 + 7780732251976.

It is an arithmetic number, because the mean of its divisors is an integer number (7780732251976).

Almost surely, 2^{15561464503951} is an apocalyptic number.

15561464503951 is a deficient number, since it is larger than the sum of its proper divisors (1).

15561464503951 is an equidigital number, since it uses as much as digits as its factorization.

15561464503951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720000, while the sum is 55.

The spelling of 15561464503951 in words is "fifteen trillion, five hundred sixty-one billion, four hundred sixty-four million, five hundred three thousand, nine hundred fifty-one".