15697616491 has 2 divisors, whose sum is σ = 15697616492. Its totient is φ = 15697616490.

The previous prime is 15697616443. The next prime is 15697616521. The reversal of 15697616491 is 19461679651.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15697616491 is a prime.

It is not a weakly prime, because it can be changed into another prime (15697316491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7848808245 + 7848808246.

It is an arithmetic number, because the mean of its divisors is an integer number (7848808246).

Almost surely, 2^15697616491 is an apocalyptic number.

15697616491 is a deficient number, since it is larger than the sum of its proper divisors (1).

15697616491 is an equidigital number, since it uses as much as digits as its factorization.

15697616491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2449440, while the sum is 55.

The spelling of 15697616491 in words is "fifteen billion, six hundred ninety-seven million, six hundred sixteen thousand, four hundred ninety-one".