19776143616 has 144 divisors (see below), whose sum is σ = 56902507200. Its totient is φ = 6076145664.

The previous prime is 19776143599. The next prime is 19776143633. The reversal of 19776143616 is 61634167791.

It is an interprime number because it is at equal distance from previous prime (19776143599) and next prime (19776143633).

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 521590 + ... + 558218.

It is an arithmetic number, because the mean of its divisors is an integer number (395156300).

Almost surely, 2^19776143616 is an apocalyptic number.

19776143616 is a gapful number since it is divisible by the number (16) 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 19776143616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28451253600).

19776143616 is an abundant number, since it is smaller than the sum of its proper divisors (37126363584).

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

19776143616 is a wasteful number, since it uses less digits than its factorization.

19776143616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36704 (or 36690 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 51.

The spelling of 19776143616 in words is "nineteen billion, seven hundred seventy-six million, one hundred forty-three thousand, six hundred sixteen".