19505781696 has 56 divisors (see below), whose sum is σ = 51918168960. Its totient is φ = 6462982912.

The previous prime is 19505781677. The next prime is 19505781721. The reversal of 19505781696 is 69618750591.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272106 + ... + 336233.

It is an arithmetic number, because the mean of its divisors is an integer number (927110160).

Almost surely, 2^19505781696 is an apocalyptic number.

19505781696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19505781696 is an abundant number, since it is smaller than the sum of its proper divisors (32412387264).

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

19505781696 is a wasteful number, since it uses less digits than its factorization.

19505781696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608521 (or 608511 counting only the distinct ones).

The product of its (nonzero) digits is 4082400, while the sum is 57.

The spelling of 19505781696 in words is "nineteen billion, five hundred five million, seven hundred eighty-one thousand, six hundred ninety-six".