19770609664 has 91 divisors (see below), whose sum is σ = 42831091213. Its totient is φ = 9124896768.

The previous prime is 19770609653. The next prime is 19770609739. The reversal of 19770609664 is 46690607791.

The square root of 19770609664 is 140608.

The cubic root of 19770609664 is 2704.

It is a perfect power (a square, a cube, a 6-th power), and thus also a powerful number.

It can be written as a sum of positive squares in 3 ways, for example, as 16962457600 + 2808152064 = 130240^2 + 52992^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 6 ways as a sum of consecutive naturals, for example, 1520816122 + ... + 1520816134.

Almost surely, 2^19770609664 is an apocalyptic number.

19770609664 is the 140608-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19770609664

19770609664 is an abundant number, since it is smaller than the sum of its proper divisors (23060481549).

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

19770609664 is an frugal number, since it uses more digits than its factorization.

19770609664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102 (or 15 counting only the distinct ones).

The product of its (nonzero) digits is 3429216, while the sum is 55.

The spelling of 19770609664 in words is "nineteen billion, seven hundred seventy million, six hundred nine thousand, six hundred sixty-four".