665918112969 has 12 divisors (see below), whose sum is σ = 987878522436. Its totient is φ = 431946883872.

The previous prime is 665918112953. The next prime is 665918112991. The reversal of 665918112969 is 969211819566.

665918112969 is a `hidden beast` number, since 6 + 6 + 591 + 8 + 11 + 29 + 6 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 506887041600 + 159031071369 = 711960^2 + 398787^2 .

It is not a de Polignac number, because 665918112969 - 2⁴ = 665918112953 is a prime.

It is a super-2 number, since 2×665918112969² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (665918112929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 999876714 + ... + 999877379.

It is an arithmetic number, because the mean of its divisors is an integer number (82323210203).

Almost surely, 2^665918112969 is an apocalyptic number.

It is an amenable number.

665918112969 is a deficient number, since it is larger than the sum of its proper divisors (321960409467).

665918112969 is a wasteful number, since it uses less digits than its factorization.

665918112969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1999754136 (or 1999754133 counting only the distinct ones).

The product of its digits is 12597120, while the sum is 63.

The spelling of 665918112969 in words is "six hundred sixty-five billion, nine hundred eighteen million, one hundred twelve thousand, nine hundred sixty-nine".