16665778131 has 8 divisors (see below), whose sum is σ = 22234123200. Its totient is φ = 11103975912.

The previous prime is 16665778111. The next prime is 16665778159. The reversal of 16665778131 is 13187756661.

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

It is not a de Polignac number, because 16665778131 - 2¹⁵ = 16665745363 is a prime.

It is a super-2 number, since 2×16665778131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16665778111) 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, 1629765 + ... + 1639958.

It is an arithmetic number, because the mean of its divisors is an integer number (2779265400).

Almost surely, 2^16665778131 is an apocalyptic number.

16665778131 is a deficient number, since it is larger than the sum of its proper divisors (5568345069).

16665778131 is a wasteful number, since it uses less digits than its factorization.

16665778131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3271425.

The product of its digits is 1270080, while the sum is 51.

The spelling of 16665778131 in words is "sixteen billion, six hundred sixty-five million, seven hundred seventy-eight thousand, one hundred thirty-one".