666766701 has 16 divisors (see below), whose sum is σ = 990508800. Its totient is φ = 443293344.

The previous prime is 666766699. The next prime is 666766703. The reversal of 666766701 is 107667666.

It is an interprime number because it is at equal distance from previous prime (666766699) and next prime (666766703).

It is not a de Polignac number, because 666766701 - 2¹ = 666766699 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666766703) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23736 + ... + 43553.

It is an arithmetic number, because the mean of its divisors is an integer number (61906800).

Almost surely, 2^666766701 is an apocalyptic number.

It is an amenable number.

666766701 is a deficient number, since it is larger than the sum of its proper divisors (323742099).

666766701 is a wasteful number, since it uses less digits than its factorization.

666766701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67665 (or 67659 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 45.

The square root of 666766701 is about 25821.8260585885. The cubic root of 666766701 is about 873.6241565707.

The spelling of 666766701 in words is "six hundred sixty-six million, seven hundred sixty-six thousand, seven hundred one".