666400104 has 48 divisors (see below), whose sum is σ = 1806819300. Its totient is φ = 221889024.

The previous prime is 666400099. The next prime is 666400109. The reversal of 666400104 is 401004666.

It is an interprime number because it is at equal distance from previous prime (666400099) and next prime (666400109).

It can be written as a sum of positive squares in 2 ways, for example, as 560268900 + 106131204 = 23670^2 + 10302^2 .

It is a super-2 number, since 2×666400104² = 888178197222421632, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (666400109) 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, 68062 + ... + 77234.

Almost surely, 2^666400104 is an apocalyptic number.

It is an amenable number.

666400104 is an abundant number, since it is smaller than the sum of its proper divisors (1140419196).

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

666400104 is a wasteful number, since it uses less digits than its factorization.

666400104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10194 (or 10187 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 666400104 is about 25814.7264947743. The cubic root of 666400104 is about 873.4640172455.

The spelling of 666400104 in words is "six hundred sixty-six million, four hundred thousand, one hundred four".