664552261 has 8 divisors (see below), whose sum is σ = 676897344. Its totient is φ = 652290240.

The previous prime is 664552247. The next prime is 664552279. The reversal of 664552261 is 162255466.

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 664552261 - 2²³ = 656163653 is a prime.

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 664552261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664552201) 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, 4500 + ... + 36733.

It is an arithmetic number, because the mean of its divisors is an integer number (84612168).

Almost surely, 2^664552261 is an apocalyptic number.

It is an amenable number.

664552261 is a deficient number, since it is larger than the sum of its proper divisors (12345083).

664552261 is a wasteful number, since it uses less digits than its factorization.

664552261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41531.

The product of its digits is 86400, while the sum is 37.

The square root of 664552261 is about 25778.9111678519. The cubic root of 664552261 is about 872.6559348883.

The spelling of 664552261 in words is "six hundred sixty-four million, five hundred fifty-two thousand, two hundred sixty-one".