665139093851 has 32 divisors (see below), whose sum is σ = 732978892800. Its totient is φ = 600765137280.

The previous prime is 665139093847. The next prime is 665139093863. The reversal of 665139093851 is 158390931566.

It is a happy number.

665139093851 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 665139093851 - 2² = 665139093847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665139092851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 354361925 + ... + 354363801.

It is an arithmetic number, because the mean of its divisors is an integer number (22905590400).

Almost surely, 2^665139093851 is an apocalyptic number.

665139093851 is a deficient number, since it is larger than the sum of its proper divisors (67839798949).

665139093851 is a wasteful number, since it uses less digits than its factorization.

665139093851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4139.

The product of its (nonzero) digits is 5248800, while the sum is 56.

The spelling of 665139093851 in words is "six hundred sixty-five billion, one hundred thirty-nine million, ninety-three thousand, eight hundred fifty-one".