667653569 has 8 divisors (see below), whose sum is σ = 737569920. Its totient is φ = 599274000.

The previous prime is 667653551. The next prime is 667653587. The reversal of 667653569 is 965356766.

It is an interprime number because it is at equal distance from previous prime (667653551) and next prime (667653587).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667653569 is a prime.

It is a super-2 number, since 2×667653569² = 891522576396875522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 667653569.

It is not an unprimeable number, because it can be changed into a prime (667653769) 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, 383282 + ... + 385019.

It is an arithmetic number, because the mean of its divisors is an integer number (92196240).

Almost surely, 2^667653569 is an apocalyptic number.

It is an amenable number.

667653569 is a deficient number, since it is larger than the sum of its proper divisors (69916351).

667653569 is a wasteful number, since it uses less digits than its factorization.

667653569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768391.

The product of its digits is 6123600, while the sum is 53.

The square root of 667653569 is about 25838.9931885900. The cubic root of 667653569 is about 874.0113214989.

The spelling of 667653569 in words is "six hundred sixty-seven million, six hundred fifty-three thousand, five hundred sixty-nine".