19777959780 has 48 divisors (see below), whose sum is σ = 55387812480. Its totient is φ = 5273215488.

The previous prime is 19777959767. The next prime is 19777959787. The reversal of 19777959780 is 8795977791.

It is not an unprimeable number, because it can be changed into a prime (19777959787) 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, 369561 + ... + 419679.

It is an arithmetic number, because the mean of its divisors is an integer number (1153912760).

Almost surely, 2^19777959780 is an apocalyptic number.

19777959780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19777959780 is an abundant number, since it is smaller than the sum of its proper divisors (35609852700).

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

19777959780 is a wasteful number, since it uses less digits than its factorization.

19777959780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56708 (or 56706 counting only the distinct ones).

The product of its (nonzero) digits is 70013160, while the sum is 69.

The spelling of 19777959780 in words is "nineteen billion, seven hundred seventy-seven million, nine hundred fifty-nine thousand, seven hundred eighty".