19521072660 has 48 divisors (see below), whose sum is σ = 54777647232. Its totient is φ = 5194320000.

The previous prime is 19521072653. The next prime is 19521072661. The reversal of 19521072660 is 6627012591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19521072661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 325216 + ... + 380535.

It is an arithmetic number, because the mean of its divisors is an integer number (1141200984).

Almost surely, 2^19521072660 is an apocalyptic number.

19521072660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19521072660 is an abundant number, since it is smaller than the sum of its proper divisors (35256574572).

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

19521072660 is a wasteful number, since it uses less digits than its factorization.

19521072660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706224 (or 706222 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 39.

The spelling of 19521072660 in words is "nineteen billion, five hundred twenty-one million, seventy-two thousand, six hundred sixty".