15616601004989 has 2 divisors, whose sum is σ = 15616601004990. Its totient is φ = 15616601004988.

The previous prime is 15616601004943. The next prime is 15616601004997. The reversal of 15616601004989 is 98940010661651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10404817922500 + 5211783082489 = 3225650^2 + 2282933^2 .

It is a cyclic number.

It is not a de Polignac number, because 15616601004989 - 2⁸ = 15616601004733 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15616601004089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7808300502494 + 7808300502495.

It is an arithmetic number, because the mean of its divisors is an integer number (7808300502495).

Almost surely, 2^{15616601004989} is an apocalyptic number.

It is an amenable number.

15616601004989 is a deficient number, since it is larger than the sum of its proper divisors (1).

15616601004989 is an equidigital number, since it uses as much as digits as its factorization.

15616601004989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2799360, while the sum is 56.

The spelling of 15616601004989 in words is "fifteen trillion, six hundred sixteen billion, six hundred one million, four thousand, nine hundred eighty-nine".