19694317140 has 36 divisors (see below), whose sum is σ = 59739429204. Its totient is φ = 5251817856.

The previous prime is 19694317127. The next prime is 19694317163. The reversal of 19694317140 is 4171349691.

It is a happy number.

19694317140 is a `hidden beast` number, since 19 + 69 + 431 + 7 + 140 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6978597444 + 12715719696 = 83538^2 + 112764^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×19694317140² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54706257 + ... + 54706616.

It is an arithmetic number, because the mean of its divisors is an integer number (1659428589).

Almost surely, 2^19694317140 is an apocalyptic number.

19694317140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19694317140 is an abundant number, since it is smaller than the sum of its proper divisors (40045112064).

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

19694317140 is a wasteful number, since it uses less digits than its factorization.

19694317140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109412888 (or 109412883 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The spelling of 19694317140 in words is "nineteen billion, six hundred ninety-four million, three hundred seventeen thousand, one hundred forty".