666667040007 has 4 divisors (see below), whose sum is σ = 888889386680. Its totient is φ = 444444693336.

The previous prime is 666667039991. The next prime is 666667040023. The reversal of 666667040007 is 700040766666.

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

It is an interprime number because it is at equal distance from previous prime (666667039991) and next prime (666667040023).

It is not a de Polignac number, because 666667040007 - 2⁴ = 666667039991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666667040027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111111173332 + ... + 111111173337.

It is an arithmetic number, because the mean of its divisors is an integer number (222222346670).

Almost surely, 2^666667040007 is an apocalyptic number.

666667040007 is a deficient number, since it is larger than the sum of its proper divisors (222222346673).

666667040007 is a wasteful number, since it uses less digits than its factorization.

666667040007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222222346672.

The product of its (nonzero) digits is 1524096, while the sum is 48.

The spelling of 666667040007 in words is "six hundred sixty-six billion, six hundred sixty-seven million, forty thousand, seven".