666455501 has 4 divisors (see below), whose sum is σ = 667674432. Its totient is φ = 665236572.

The previous prime is 666455497. The next prime is 666455509. The reversal of 666455501 is 105554666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 666455501 - 2² = 666455497 is a prime.

It is a super-2 number, since 2×666455501² = 888325869626322002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666455509) 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, 608645 + ... + 609738.

It is an arithmetic number, because the mean of its divisors is an integer number (166918608).

Almost surely, 2^666455501 is an apocalyptic number.

It is an amenable number.

666455501 is a deficient number, since it is larger than the sum of its proper divisors (1218931).

666455501 is a wasteful number, since it uses less digits than its factorization.

666455501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218930.

The product of its (nonzero) digits is 108000, while the sum is 38.

The square root of 666455501 is about 25815.7994453009. The cubic root of 666455501 is about 873.4882198955.

The spelling of 666455501 in words is "six hundred sixty-six million, four hundred fifty-five thousand, five hundred one".