19666057410 has 24 divisors (see below), whose sum is σ = 51131749500. Its totient is φ = 5244281952.

The previous prime is 19666057409. The next prime is 19666057429. The reversal of 19666057410 is 1475066691.

It can be written as a sum of positive squares in 2 ways, for example, as 17751032289 + 1915025121 = 133233^2 + 43761^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 109255785 + ... + 109255964.

Almost surely, 2^19666057410 is an apocalyptic number.

19666057410 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19666057410 is an abundant number, since it is smaller than the sum of its proper divisors (31465692090).

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

19666057410 is a wasteful number, since it uses less digits than its factorization.

19666057410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218511762 (or 218511759 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The spelling of 19666057410 in words is "nineteen billion, six hundred sixty-six million, fifty-seven thousand, four hundred ten".