666734007400 has 48 divisors (see below), whose sum is σ = 1559117090700. Its totient is φ = 265152007680.

The previous prime is 666734007397. The next prime is 666734007403. The reversal of 666734007400 is 4700437666.

It is an interprime number because it is at equal distance from previous prime (666734007397) and next prime (666734007403).

It can be written as a sum of positive squares in 6 ways, for example, as 307144290436 + 359589716964 = 554206^2 + 599658^2 .

It is not an unprimeable number, because it can be changed into a prime (666734007403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9600285 + ... + 9669484.

Almost surely, 2^666734007400 is an apocalyptic number.

It is an amenable number.

666734007400 is an abundant number, since it is smaller than the sum of its proper divisors (892383083300).

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

666734007400 is a wasteful number, since it uses less digits than its factorization.

666734007400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19269958 (or 19269949 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 43.

The spelling of 666734007400 in words is "six hundred sixty-six billion, seven hundred thirty-four million, seven thousand, four hundred".