666465601 has 8 divisors (see below), whose sum is σ = 671736960. Its totient is φ = 661215408.

The previous prime is 666465599. The next prime is 666465607. The reversal of 666465601 is 106564666.

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 666465601 - 2¹ = 666465599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666465607) 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, 61170 + ... + 71236.

It is an arithmetic number, because the mean of its divisors is an integer number (83967120).

Almost surely, 2^666465601 is an apocalyptic number.

It is an amenable number.

666465601 is a deficient number, since it is larger than the sum of its proper divisors (5271359).

666465601 is a wasteful number, since it uses less digits than its factorization.

666465601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10583.

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 666465601 is about 25815.9950612019. The cubic root of 666465601 is about 873.4926323864.

The spelling of 666465601 in words is "six hundred sixty-six million, four hundred sixty-five thousand, six hundred one".