15615671009 has 2 divisors, whose sum is σ = 15615671010. Its totient is φ = 15615671008.

The previous prime is 15615670997. The next prime is 15615671017. The reversal of 15615671009 is 90017651651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15411981025 + 203689984 = 124145^2 + 14272^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15615671009 is a prime.

It is a super-2 number, since 2×15615671009² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15615671089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7807835504 + 7807835505.

It is an arithmetic number, because the mean of its divisors is an integer number (7807835505).

Almost surely, 2^15615671009 is an apocalyptic number.

It is an amenable number.

15615671009 is a deficient number, since it is larger than the sum of its proper divisors (1).

15615671009 is an equidigital number, since it uses as much as digits as its factorization.

15615671009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56700, while the sum is 41.

The spelling of 15615671009 in words is "fifteen billion, six hundred fifteen million, six hundred seventy-one thousand, nine".