649585557 has 12 divisors (see below), whose sum is σ = 939303820. Its totient is φ = 432589248.

The previous prime is 649585537. The next prime is 649585567. The reversal of 649585557 is 755585946.

649585557 is a `hidden beast` number, since 6 + 4 + 9 + 5 + 85 + 557 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 282441636 + 367143921 = 16806^2 + 19161^2 .

It is not a de Polignac number, because 649585557 - 2⁶ = 649585493 is a prime.

It is a super-2 number, since 2×649585557² = 843922791726000498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649585537) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30082 + ... + 46947.

Almost surely, 2^649585557 is an apocalyptic number.

It is an amenable number.

649585557 is a deficient number, since it is larger than the sum of its proper divisors (289718263).

649585557 is a wasteful number, since it uses less digits than its factorization.

649585557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77972 (or 77969 counting only the distinct ones).

The product of its digits is 7560000, while the sum is 54.

The square root of 649585557 is about 25486.9683760152. The cubic root of 649585557 is about 866.0549601809.

The spelling of 649585557 in words is "six hundred forty-nine million, five hundred eighty-five thousand, five hundred fifty-seven".