18661261852 has 36 divisors (see below), whose sum is σ = 34285918576. Its totient is φ = 8885358720.

The previous prime is 18661261831. The next prime is 18661261877. The reversal of 18661261852 is 25816216681.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 207577 + ... + 283567.

Almost surely, 2^18661261852 is an apocalyptic number.

It is an amenable number.

18661261852 is a deficient number, since it is larger than the sum of its proper divisors (15624656724).

18661261852 is a wasteful number, since it uses less digits than its factorization.

18661261852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76126 (or 76095 counting only the distinct ones).

The product of its digits is 276480, while the sum is 46.

The spelling of 18661261852 in words is "eighteen billion, six hundred sixty-one million, two hundred sixty-one thousand, eight hundred fifty-two".