19776771168 has 384 divisors, whose sum is σ = 68349173760. Its totient is φ = 4854558720.

The previous prime is 19776771151. The next prime is 19776771187. The reversal of 19776771168 is 86117767791.

It is a super-2 number, since 2×19776771168² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15130771 + ... + 15132077.

It is an arithmetic number, because the mean of its divisors is an integer number (177992640).

Almost surely, 2^19776771168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19776771168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34174586880).

19776771168 is an abundant number, since it is smaller than the sum of its proper divisors (48572402592).

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

19776771168 is a wasteful number, since it uses less digits than its factorization.

19776771168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1450 (or 1442 counting only the distinct ones).

The product of its digits is 6223392, while the sum is 60.

The spelling of 19776771168 in words is "nineteen billion, seven hundred seventy-six million, seven hundred seventy-one thousand, one hundred sixty-eight".