19564208740 has 12 divisors (see below), whose sum is σ = 41084838396. Its totient is φ = 7825683488.

The previous prime is 19564208639. The next prime is 19564208747. The reversal of 19564208740 is 4780246591.

It can be written as a sum of positive squares in 2 ways, for example, as 5392258624 + 14171950116 = 73432^2 + 119046^2 .

It is not an unprimeable number, because it can be changed into a prime (19564208747) 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, 489105199 + ... + 489105238.

It is an arithmetic number, because the mean of its divisors is an integer number (3423736533).

Almost surely, 2^19564208740 is an apocalyptic number.

19564208740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19564208740 is an abundant number, since it is smaller than the sum of its proper divisors (21520629656).

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

19564208740 is a wasteful number, since it uses less digits than its factorization.

19564208740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978210446 (or 978210444 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 46.

The spelling of 19564208740 in words is "nineteen billion, five hundred sixty-four million, two hundred eight thousand, seven hundred forty".