15697738643 has 2 divisors, whose sum is σ = 15697738644. Its totient is φ = 15697738642.

The previous prime is 15697738621. The next prime is 15697738673. The reversal of 15697738643 is 34683779651.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15697738643 - 2¹⁰ = 15697737619 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (15697738673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7848869321 + 7848869322.

It is an arithmetic number, because the mean of its divisors is an integer number (7848869322).

Almost surely, 2^15697738643 is an apocalyptic number.

15697738643 is a deficient number, since it is larger than the sum of its proper divisors (1).

15697738643 is an equidigital number, since it uses as much as digits as its factorization.

15697738643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22861440, while the sum is 59.

The spelling of 15697738643 in words is "fifteen billion, six hundred ninety-seven million, seven hundred thirty-eight thousand, six hundred forty-three".