666740400007 has 8 divisors (see below), whose sum is σ = 747011357712. Its totient is φ = 589745808000.

The previous prime is 666740399953. The next prime is 666740400013. The reversal of 666740400007 is 700004047666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 666740400007 - 2⁷ = 666740399879 is a prime.

It is a super-2 number, since 2×666740400007² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666740400017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 819090994 + ... + 819091807.

It is an arithmetic number, because the mean of its divisors is an integer number (93376419714).

Almost surely, 2^666740400007 is an apocalyptic number.

666740400007 is a deficient number, since it is larger than the sum of its proper divisors (80270957705).

666740400007 is a wasteful number, since it uses less digits than its factorization.

666740400007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1638182849.

The product of its (nonzero) digits is 169344, while the sum is 40.

The spelling of 666740400007 in words is "six hundred sixty-six billion, seven hundred forty million, four hundred thousand, seven".