666000778236 has 24 divisors (see below), whose sum is σ = 1575289514064. Its totient is φ = 218959159680.

The previous prime is 666000778231. The next prime is 666000778253. The reversal of 666000778236 is 632877000666.

It is a happy number.

It is a super-2 number, since 2×666000778236² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666000778231) 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, 380136555 + ... + 380138306.

It is an arithmetic number, because the mean of its divisors is an integer number (65637063086).

Almost surely, 2^666000778236 is an apocalyptic number.

It is an amenable number.

666000778236 is an abundant number, since it is smaller than the sum of its proper divisors (909288735828).

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

666000778236 is a wasteful number, since it uses less digits than its factorization.

666000778236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760274941 (or 760274939 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 51.

The spelling of 666000778236 in words is "six hundred sixty-six billion, seven hundred seventy-eight thousand, two hundred thirty-six".