16665778136 has 16 divisors (see below), whose sum is σ = 35712381840. Its totient is φ = 7142476320.

The previous prime is 16665778111. The next prime is 16665778159. The reversal of 16665778136 is 63187756661.

It is a Harshad number since it is a multiple of its sum of digits (56), and also a Moran number because the ratio is a prime number: 297603181 = 16665778136 / (1 + 6 + 6 + 6 + 5 + 7 + 7 + 8 + 1 + 3 + 6).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148801535 + ... + 148801646.

It is an arithmetic number, because the mean of its divisors is an integer number (2232023865).

Almost surely, 2^16665778136 is an apocalyptic number.

It is an amenable number.

16665778136 is an abundant number, since it is smaller than the sum of its proper divisors (19046603704).

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

16665778136 is a wasteful number, since it uses less digits than its factorization.

16665778136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297603194 (or 297603190 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 56.

The spelling of 16665778136 in words is "sixteen billion, six hundred sixty-five million, seven hundred seventy-eight thousand, one hundred thirty-six".