15001105111561 has 2 divisors, whose sum is σ = 15001105111562. Its totient is φ = 15001105111560.

The previous prime is 15001105111511. The next prime is 15001105111567. The reversal of 15001105111561 is 16511150110051.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7889042857536 + 7112062254025 = 2808744^2 + 2666845^2 .

It is a cyclic number.

It is not a de Polignac number, because 15001105111561 - 2²⁷ = 15000970893833 is a prime.

It is not a weakly prime, because it can be changed into another prime (15001105111567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7500552555780 + 7500552555781.

It is an arithmetic number, because the mean of its divisors is an integer number (7500552555781).

Almost surely, 2^{15001105111561} is an apocalyptic number.

It is an amenable number.

15001105111561 is a deficient number, since it is larger than the sum of its proper divisors (1).

15001105111561 is an equidigital number, since it uses as much as digits as its factorization.

15001105111561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 750, while the sum is 28.

The spelling of 15001105111561 in words is "fifteen trillion, one billion, one hundred five million, one hundred eleven thousand, five hundred sixty-one".