666704040038 has 4 divisors (see below), whose sum is σ = 1000056060060. Its totient is φ = 333352020018.

The previous prime is 666704040017. The next prime is 666704040043. The reversal of 666704040038 is 830040407666.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×666704040038² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166676010008 + ... + 166676010011.

It is an arithmetic number, because the mean of its divisors is an integer number (250014015015).

Almost surely, 2^666704040038 is an apocalyptic number.

666704040038 is a deficient number, since it is larger than the sum of its proper divisors (333352020022).

666704040038 is a wasteful number, since it uses less digits than its factorization.

666704040038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333352020021.

The product of its (nonzero) digits is 580608, while the sum is 44.

The spelling of 666704040038 in words is "six hundred sixty-six billion, seven hundred four million, forty thousand, thirty-eight".