18941981570 has 16 divisors (see below), whose sum is σ = 36101188728. Its totient is φ = 7131098880.

The previous prime is 18941981561. The next prime is 18941981599. The reversal of 18941981570 is 7518914981.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16494008041 + 2447973529 = 128429^2 + 49477^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55711541 + ... + 55711880.

Almost surely, 2^18941981570 is an apocalyptic number.

18941981570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18941981570 is a deficient number, since it is larger than the sum of its proper divisors (17159207158).

18941981570 is a wasteful number, since it uses less digits than its factorization.

18941981570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111423445.

The product of its (nonzero) digits is 725760, while the sum is 53.

The spelling of 18941981570 in words is "eighteen billion, nine hundred forty-one million, nine hundred eighty-one thousand, five hundred seventy".