666376565 has 8 divisors (see below), whose sum is σ = 800037888. Its totient is φ = 532843920.

The previous prime is 666376561. The next prime is 666376577. The reversal of 666376565 is 565673666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 666376565 - 2² = 666376561 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666376561) 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, 20381 + ... + 41810.

It is an arithmetic number, because the mean of its divisors is an integer number (100004736).

Almost surely, 2^666376565 is an apocalyptic number.

It is an amenable number.

666376565 is a deficient number, since it is larger than the sum of its proper divisors (133661323).

666376565 is a wasteful number, since it uses less digits than its factorization.

666376565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64339.

The product of its digits is 4082400, while the sum is 50.

The square root of 666376565 is about 25814.2705688152. The cubic root of 666376565 is about 873.4537327776.

The spelling of 666376565 in words is "six hundred sixty-six million, three hundred seventy-six thousand, five hundred sixty-five".