15666492721488 has 160 divisors (see below), whose sum is σ = 48269492269056. Its totient is φ = 4281080838144.

The previous prime is 15666492721441. The next prime is 15666492721547. The reversal of 15666492721488 is 88412729466651.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77975656 + ... + 78176312.

Almost surely, 2^{15666492721488} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15666492721488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24134746134528).

15666492721488 is an abundant number, since it is smaller than the sum of its proper divisors (32602999547568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15666492721488 is a wasteful number, since it uses less digits than its factorization.

15666492721488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210801 (or 210795 counting only the distinct ones).

The product of its digits is 278691840, while the sum is 69.

The spelling of 15666492721488 in words is "fifteen trillion, six hundred sixty-six billion, four hundred ninety-two million, seven hundred twenty-one thousand, four hundred eighty-eight".