15786340661 has 16 divisors (see below), whose sum is σ = 19434852864. Its totient is φ = 12486749184.

The previous prime is 15786340597. The next prime is 15786340679. The reversal of 15786340661 is 16604368751.

It is not a de Polignac number, because 15786340661 - 2⁶ = 15786340597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15786340681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 325205 + ... + 370581.

It is an arithmetic number, because the mean of its divisors is an integer number (1214678304).

Almost surely, 2^15786340661 is an apocalyptic number.

It is an amenable number.

15786340661 is a deficient number, since it is larger than the sum of its proper divisors (3648512203).

15786340661 is a wasteful number, since it uses less digits than its factorization.

15786340661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49220.

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 15786340661 in words is "fifteen billion, seven hundred eighty-six million, three hundred forty thousand, six hundred sixty-one".