15966664291 has 16 divisors (see below), whose sum is σ = 16165624320. Its totient is φ = 15769428480.

The previous prime is 15966664289. The next prime is 15966664313. The reversal of 15966664291 is 19246666951.

It is a cyclic number.

It is not a de Polignac number, because 15966664291 - 2¹ = 15966664289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15966664271) 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, 24450921 + ... + 24451573.

It is an arithmetic number, because the mean of its divisors is an integer number (1010351520).

Almost surely, 2^15966664291 is an apocalyptic number.

15966664291 is a deficient number, since it is larger than the sum of its proper divisors (198960029).

15966664291 is a wasteful number, since it uses less digits than its factorization.

15966664291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1566.

The product of its digits is 4199040, while the sum is 55.

The spelling of 15966664291 in words is "fifteen billion, nine hundred sixty-six million, six hundred sixty-four thousand, two hundred ninety-one".