19965503376 has 800 divisors, whose sum is σ = 75714265088. Its totient is φ = 4938071040.

The previous prime is 19965503353. The next prime is 19965503461. The reversal of 19965503376 is 67330556991.

19965503376 is a `hidden beast` number, since 1 + 9 + 9 + 65 + 503 + 3 + 76 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 157208625 + ... + 157208751.

Almost surely, 2^19965503376 is an apocalyptic number.

19965503376 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 19965503376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37857132544).

19965503376 is an abundant number, since it is smaller than the sum of its proper divisors (55748761712).

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

19965503376 is a wasteful number, since it uses less digits than its factorization.

19965503376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 226 counting only the distinct ones).

The product of its (nonzero) digits is 4592700, while the sum is 54.

The spelling of 19965503376 in words is "nineteen billion, nine hundred sixty-five million, five hundred three thousand, three hundred seventy-six".