19194862640 has 20 divisors (see below), whose sum is σ = 44628055824. Its totient is φ = 7677945024.

The previous prime is 19194862541. The next prime is 19194862649. The reversal of 19194862640 is 4626849191.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (19194862649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119967812 + ... + 119967971.

Almost surely, 2^19194862640 is an apocalyptic number.

19194862640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19194862640 is an abundant number, since it is smaller than the sum of its proper divisors (25433193184).

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

19194862640 is a wasteful number, since it uses less digits than its factorization.

19194862640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239935796 (or 239935790 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 50.

The spelling of 19194862640 in words is "nineteen billion, one hundred ninety-four million, eight hundred sixty-two thousand, six hundred forty".