19661819160 has 64 divisors (see below), whose sum is σ = 60098410080. Its totient is φ = 5144222720.

The previous prime is 19661819143. The next prime is 19661819167. The reversal of 19661819160 is 6191816691.

It is a happy number.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19661819167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1539381 + ... + 1552100.

Almost surely, 2^19661819160 is an apocalyptic number.

19661819160 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19661819160 is an abundant number, since it is smaller than the sum of its proper divisors (40436590920).

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

19661819160 is a wasteful number, since it uses less digits than its factorization.

19661819160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3091548 (or 3091544 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 48.

The spelling of 19661819160 in words is "nineteen billion, six hundred sixty-one million, eight hundred nineteen thousand, one hundred sixty".