19963857465 has 48 divisors (see below), whose sum is σ = 35722507392. Its totient is φ = 10307630592.

The previous prime is 19963857451. The next prime is 19963857467. The reversal of 19963857465 is 56475836991.

19963857465 is a `hidden beast` number, since 1 + 9 + 96 + 3 + 85 + 7 + 465 = 666.

It is not a de Polignac number, because 19963857465 - 2⁷ = 19963857337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19963857467) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 173004 + ... + 264306.

It is an arithmetic number, because the mean of its divisors is an integer number (744218904).

Almost surely, 2^19963857465 is an apocalyptic number.

19963857465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19963857465 is a deficient number, since it is larger than the sum of its proper divisors (15758649927).

19963857465 is a wasteful number, since it uses less digits than its factorization.

19963857465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91470 (or 91467 counting only the distinct ones).

The product of its digits is 48988800, while the sum is 63.

The spelling of 19963857465 in words is "nineteen billion, nine hundred sixty-three million, eight hundred fifty-seven thousand, four hundred sixty-five".