15611555656651 has 2 divisors, whose sum is σ = 15611555656652. Its totient is φ = 15611555656650.

The previous prime is 15611555656547. The next prime is 15611555656681. The reversal of 15611555656651 is 15665655511651.

It is a strong prime.

It is an emirp because it is prime and its reverse (15665655511651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15611555656651 - 2⁷ = 15611555656523 is a prime.

It is not a weakly prime, because it can be changed into another prime (15611555656681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7805777828325 + 7805777828326.

It is an arithmetic number, because the mean of its divisors is an integer number (7805777828326).

Almost surely, 2^{15611555656651} is an apocalyptic number.

15611555656651 is a deficient number, since it is larger than the sum of its proper divisors (1).

15611555656651 is an equidigital number, since it uses as much as digits as its factorization.

15611555656651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20250000, while the sum is 58.

The spelling of 15611555656651 in words is "fifteen trillion, six hundred eleven billion, five hundred fifty-five million, six hundred fifty-six thousand, six hundred fifty-one".