656149085 has 8 divisors (see below), whose sum is σ = 833695416. Its totient is φ = 494041600.

The previous prime is 656149079. The next prime is 656149103. The reversal of 656149085 is 580941656.

It can be written as a sum of positive squares in 4 ways, for example, as 351262564 + 304886521 = 18742^2 + 17461^2 .

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

It is not a de Polignac number, because 656149085 - 2¹⁸ = 655886941 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent 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, 3859616 + ... + 3859785.

It is an arithmetic number, because the mean of its divisors is an integer number (104211927).

Almost surely, 2^656149085 is an apocalyptic number.

It is an amenable number.

656149085 is a deficient number, since it is larger than the sum of its proper divisors (177546331).

656149085 is a wasteful number, since it uses less digits than its factorization.

656149085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7719423.

The product of its (nonzero) digits is 259200, while the sum is 44.

The square root of 656149085 is about 25615.4071800547. The cubic root of 656149085 is about 868.9621150361.

The spelling of 656149085 in words is "six hundred fifty-six million, one hundred forty-nine thousand, eighty-five".