666437001 has 16 divisors (see below), whose sum is σ = 915546240. Its totient is φ = 430935680.

The previous prime is 666436987. The next prime is 666437033. The reversal of 666437001 is 100734666.

It is a cyclic number.

It is not a de Polignac number, because 666437001 - 2¹⁰ = 666435977 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (666437041) 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, 5620 + ... + 36938.

It is an arithmetic number, because the mean of its divisors is an integer number (57221640).

Almost surely, 2^666437001 is an apocalyptic number.

It is an amenable number.

666437001 is a deficient number, since it is larger than the sum of its proper divisors (249109239).

666437001 is a wasteful number, since it uses less digits than its factorization.

666437001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31536.

The product of its (nonzero) digits is 18144, while the sum is 33.

The square root of 666437001 is about 25815.4411351036. The cubic root of 666437001 is about 873.4801374946.

The spelling of 666437001 in words is "six hundred sixty-six million, four hundred thirty-seven thousand, one".