15661362971 has 8 divisors (see below), whose sum is σ = 16212838080. Its totient is φ = 15110649792.

The previous prime is 15661362917. The next prime is 15661362973. The reversal of 15661362971 is 17926316651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15661362971 - 2¹⁴ = 15661346587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15661362973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148490 + ... + 231023.

It is an arithmetic number, because the mean of its divisors is an integer number (2026604760).

Almost surely, 2^15661362971 is an apocalyptic number.

15661362971 is a deficient number, since it is larger than the sum of its proper divisors (551475109).

15661362971 is a wasteful number, since it uses less digits than its factorization.

15661362971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380965.

The product of its digits is 408240, while the sum is 47.

The spelling of 15661362971 in words is "fifteen billion, six hundred sixty-one million, three hundred sixty-two thousand, nine hundred seventy-one".