19696091550 has 48 divisors (see below), whose sum is σ = 49005530112. Its totient is φ = 5235170400.

The previous prime is 19696091539. The next prime is 19696091551. The reversal of 19696091550 is 5519069691.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 19696091493 and 19696091502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19696091551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 167806 + ... + 259905.

It is an arithmetic number, because the mean of its divisors is an integer number (1020948544).

Almost surely, 2^19696091550 is an apocalyptic number.

19696091550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19696091550 is an abundant number, since it is smaller than the sum of its proper divisors (29309438562).

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

19696091550 is a wasteful number, since it uses less digits than its factorization.

19696091550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428033 (or 428028 counting only the distinct ones).

The product of its (nonzero) digits is 656100, while the sum is 51.

The spelling of 19696091550 in words is "nineteen billion, six hundred ninety-six million, ninety-one thousand, five hundred fifty".