19777311880 has 64 divisors (see below), whose sum is σ = 45101952000. Its totient is φ = 7803903744.

The previous prime is 19777311863. The next prime is 19777311881. The reversal of 19777311880 is 8811377791.

It is a happy number.

It is a super-2 number, since 2×19777311880² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19777311881) 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, 5044561 + ... + 5048479.

It is an arithmetic number, because the mean of its divisors is an integer number (704718000).

Almost surely, 2^19777311880 is an apocalyptic number.

19777311880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19777311880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22550976000).

19777311880 is an abundant number, since it is smaller than the sum of its proper divisors (25324640120).

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

19777311880 is a wasteful number, since it uses less digits than its factorization.

19777311880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5606 (or 5602 counting only the distinct ones).

The product of its (nonzero) digits is 592704, while the sum is 52.

The spelling of 19777311880 in words is "nineteen billion, seven hundred seventy-seven million, three hundred eleven thousand, eight hundred eighty".