11605870658 has 18 divisors (see below), whose sum is σ = 18497219403. Its totient is φ = 5460367360.

The previous prime is 11605870579. The next prime is 11605870691. The reversal of 11605870658 is 85607850611.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 11203587409 + 402283249 = 105847^2 + 20057^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=76177.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2587778 + ... + 2592258.

Almost surely, 2^11605870658 is an apocalyptic number.

11605870658 is a deficient number, since it is larger than the sum of its proper divisors (6891348745).

11605870658 is an frugal number, since it uses more digits than its factorization.

11605870658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8998 (or 4500 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 47.

The spelling of 11605870658 in words is "eleven billion, six hundred five million, eight hundred seventy thousand, six hundred fifty-eight".