19990607616 has 324 divisors, whose sum is σ = 67684623552. Its totient is φ = 5657444352.

The previous prime is 19990607599. The next prime is 19990607633. The reversal of 19990607616 is 61670609991.

19990607616 is a `hidden beast` number, since 19 + 9 + 9 + 0 + 6 + 0 + 7 + 616 = 666.

It is an interprime number because it is at equal distance from previous prime (19990607599) and next prime (19990607633).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 12756465 + ... + 12758031.

Almost surely, 2^19990607616 is an apocalyptic number.

19990607616 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 19990607616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33842311776).

19990607616 is an abundant number, since it is smaller than the sum of its proper divisors (47694015936).

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

19990607616 is a wasteful number, since it uses less digits than its factorization.

19990607616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1716 (or 1692 counting only the distinct ones).

The product of its (nonzero) digits is 1102248, while the sum is 54.

The spelling of 19990607616 in words is "nineteen billion, nine hundred ninety million, six hundred seven thousand, six hundred sixteen".