15690771647 has 4 divisors (see below), whose sum is σ = 15702833496. Its totient is φ = 15678709800.

The previous prime is 15690771617. The next prime is 15690771661. The reversal of 15690771647 is 74617709651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74617709651 = 2939 ⋅25388809.

It is a cyclic number.

It is not a de Polignac number, because 15690771647 - 2²⁸ = 15422336191 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 (15690771617) 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, 6028973 + ... + 6031574.

It is an arithmetic number, because the mean of its divisors is an integer number (3925708374).

Almost surely, 2^15690771647 is an apocalyptic number.

15690771647 is a deficient number, since it is larger than the sum of its proper divisors (12061849).

15690771647 is a wasteful number, since it uses less digits than its factorization.

15690771647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12061848.

The product of its (nonzero) digits is 2222640, while the sum is 53.

The spelling of 15690771647 in words is "fifteen billion, six hundred ninety million, seven hundred seventy-one thousand, six hundred forty-seven".