19808310564 has 135 divisors (see below), whose sum is σ = 60291153153. Its totient is φ = 5654450592.

The previous prime is 19808310547. The next prime is 19808310569. The reversal of 19808310564 is 46501380891.

The square root of 19808310564 is 140742.

It is a perfect power (a square), and thus also a powerful number.

19808310564 is a `hidden beast` number, since 1 + 9 + 8 + 0 + 83 + 1 + 0 + 564 = 666.

It can be written as a sum of positive squares in only one way, i.e., 876752100 + 18931558464 = 29610^2 + 137592^2 .

It is not an unprimeable number, because it can be changed into a prime (19808310569) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 17732934 + ... + 17734050.

Almost surely, 2^19808310564 is an apocalyptic number.

19808310564 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

19808310564 is the 140742-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19808310564

19808310564 is an abundant number, since it is smaller than the sum of its proper divisors (40482842589).

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

19808310564 is an equidigital number, since it uses as much as digits as its factorization.

19808310564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2264 (or 1129 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 19808310564 in words is "nineteen billion, eight hundred eight million, three hundred ten thousand, five hundred sixty-four".