15606106561 has 2 divisors, whose sum is σ = 15606106562. Its totient is φ = 15606106560.

The previous prime is 15606106553. The next prime is 15606106601. The reversal of 15606106561 is 16560160651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13521270961 + 2084835600 = 116281^2 + 45660^2 .

It is a cyclic number.

It is not a de Polignac number, because 15606106561 - 2³ = 15606106553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15606106561.

It is not a weakly prime, because it can be changed into another prime (15606106511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7803053280 + 7803053281.

It is an arithmetic number, because the mean of its divisors is an integer number (7803053281).

Almost surely, 2^15606106561 is an apocalyptic number.

It is an amenable number.

15606106561 is a deficient number, since it is larger than the sum of its proper divisors (1).

15606106561 is an equidigital number, since it uses as much as digits as its factorization.

15606106561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 15606106561 in words is "fifteen billion, six hundred six million, one hundred six thousand, five hundred sixty-one".