15656555647 has 2 divisors, whose sum is σ = 15656555648. Its totient is φ = 15656555646.

The previous prime is 15656555633. The next prime is 15656555657. The reversal of 15656555647 is 74655565651.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15656555647 - 2³¹ = 13509071999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15656555657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7828277823 + 7828277824.

It is an arithmetic number, because the mean of its divisors is an integer number (7828277824).

Almost surely, 2^15656555647 is an apocalyptic number.

15656555647 is a deficient number, since it is larger than the sum of its proper divisors (1).

15656555647 is an equidigital number, since it uses as much as digits as its factorization.

15656555647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18900000, while the sum is 55.

It can be divided in two parts, 156565 and 55647, that added together give a palindrome (212212).

The spelling of 15656555647 in words is "fifteen billion, six hundred fifty-six million, five hundred fifty-five thousand, six hundred forty-seven".