19941777772 has 24 divisors (see below), whose sum is σ = 39930033920. Its totient is φ = 8536516560.

The previous prime is 19941777763. The next prime is 19941777773. The reversal of 19941777772 is 27777714991.

It is a self number, because there is not a number n which added to its sum of digits gives 19941777772.

It is not an unprimeable number, because it can be changed into a prime (19941777773) 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 7 ways as a sum of consecutive naturals, for example, 390504 + ... + 438607.

Almost surely, 2^19941777772 is an apocalyptic number.

It is an amenable number.

19941777772 is an abundant number, since it is smaller than the sum of its proper divisors (19988256148).

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

19941777772 is a wasteful number, since it uses less digits than its factorization.

19941777772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 829981 (or 829979 counting only the distinct ones).

The product of its digits is 10890936, while the sum is 61.

The spelling of 19941777772 in words is "nineteen billion, nine hundred forty-one million, seven hundred seventy-seven thousand, seven hundred seventy-two".