667401007 has 8 divisors (see below), whose sum is σ = 821416736. Its totient is φ = 528053472.

The previous prime is 667401001. The next prime is 667401013. The reversal of 667401007 is 700104766.

It is an interprime number because it is at equal distance from previous prime (667401001) and next prime (667401013).

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 667401007 - 2²⁷ = 533183279 is a prime.

It is a super-2 number, since 2×667401007² = 890848208289228098, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 667401007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667401001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3666948 + ... + 3667129.

It is an arithmetic number, because the mean of its divisors is an integer number (102677092).

Almost surely, 2^667401007 is an apocalyptic number.

667401007 is a deficient number, since it is larger than the sum of its proper divisors (154015729).

667401007 is a wasteful number, since it uses less digits than its factorization.

667401007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7334097.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 667401007 is about 25834.1055002878. The cubic root of 667401007 is about 873.9010997223.

The spelling of 667401007 in words is "six hundred sixty-seven million, four hundred one thousand, seven".