15972894649 has 8 divisors (see below), whose sum is σ = 16140176640. Its totient is φ = 15805666176.

The previous prime is 15972894647. The next prime is 15972894667. The reversal of 15972894649 is 94649827951.

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 15972894649 - 2¹ = 15972894647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15972894647) 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, 934272 + ... + 951214.

It is an arithmetic number, because the mean of its divisors is an integer number (2017522080).

Almost surely, 2^15972894649 is an apocalyptic number.

It is an amenable number.

15972894649 is a deficient number, since it is larger than the sum of its proper divisors (167281991).

15972894649 is an equidigital number, since it uses as much as digits as its factorization.

15972894649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26759.

The product of its digits is 39191040, while the sum is 64.

The spelling of 15972894649 in words is "fifteen billion, nine hundred seventy-two million, eight hundred ninety-four thousand, six hundred forty-nine".