652640665 has 8 divisors (see below), whose sum is σ = 802270728. Its totient is φ = 509377920.

The previous prime is 652640657. The next prime is 652640699. The reversal of 652640665 is 566046256.

It can be written as a sum of positive squares in 4 ways, for example, as 31036041 + 621604624 = 5571^2 + 24932^2 .

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

It is not a de Polignac number, because 652640665 - 2³ = 652640657 is a prime.

It is a super-2 number, since 2×652640665² = 851879675223284450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1591602 + ... + 1592011.

It is an arithmetic number, because the mean of its divisors is an integer number (100283841).

Almost surely, 2^652640665 is an apocalyptic number.

It is an amenable number.

652640665 is a deficient number, since it is larger than the sum of its proper divisors (149630063).

652640665 is a wasteful number, since it uses less digits than its factorization.

652640665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3183659.

The product of its (nonzero) digits is 259200, while the sum is 40.

The square root of 652640665 is about 25546.8327782526. The cubic root of 652640665 is about 867.4105702782.

The spelling of 652640665 in words is "six hundred fifty-two million, six hundred forty thousand, six hundred sixty-five".