15968680921 has 8 divisors (see below), whose sum is σ = 16017528384. Its totient is φ = 15919866480.

The previous prime is 15968680883. The next prime is 15968680957. The reversal of 15968680921 is 12908686951.

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 15968680921 - 2¹⁵ = 15968648153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15968680961) 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, 1242036 + ... + 1254826.

It is an arithmetic number, because the mean of its divisors is an integer number (2002191048).

Almost surely, 2^15968680921 is an apocalyptic number.

It is an amenable number.

15968680921 is a deficient number, since it is larger than the sum of its proper divisors (48847463).

15968680921 is a wasteful number, since it uses less digits than its factorization.

15968680921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16511.

The product of its (nonzero) digits is 1866240, while the sum is 55.

The spelling of 15968680921 in words is "fifteen billion, nine hundred sixty-eight million, six hundred eighty thousand, nine hundred twenty-one".