15697960909 has 4 divisors (see below), whose sum is σ = 15772359040. Its totient is φ = 15623562780.

The previous prime is 15697960879. The next prime is 15697960933. The reversal of 15697960909 is 90906979651.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90906979651 = 2437 ⋅37302823.

It is a cyclic number.

It is not a de Polignac number, because 15697960909 - 2¹⁷ = 15697829837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15697960309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37198749 + ... + 37199170.

It is an arithmetic number, because the mean of its divisors is an integer number (3943089760).

Almost surely, 2^15697960909 is an apocalyptic number.

It is an amenable number.

15697960909 is a deficient number, since it is larger than the sum of its proper divisors (74398131).

15697960909 is an equidigital number, since it uses as much as digits as its factorization.

15697960909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74398130.

The product of its (nonzero) digits is 8266860, while the sum is 61.

The spelling of 15697960909 in words is "fifteen billion, six hundred ninety-seven million, nine hundred sixty thousand, nine hundred nine".