1913625666 has 24 divisors (see below), whose sum is σ = 4149110784. Its totient is φ = 637425720.

The previous prime is 1913625661. The next prime is 1913625751. The reversal of 1913625666 is 6665263191.

It is not an unprimeable number, because it can be changed into a prime (1913625661) 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, 10690 + ... + 62781.

It is an arithmetic number, because the mean of its divisors is an integer number (172879616).

Almost surely, 2^1913625666 is an apocalyptic number.

1913625666 is an abundant number, since it is smaller than the sum of its proper divisors (2235485118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1913625666 is a wasteful number, since it uses less digits than its factorization.

1913625666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74926 (or 74923 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

The square root of 1913625666 is about 43745.0073265510. The cubic root of 1913625666 is about 1241.5160234000.

The spelling of 1913625666 in words is "one billion, nine hundred thirteen million, six hundred twenty-five thousand, six hundred sixty-six".