19669501504 has 63 divisors (see below), whose sum is σ = 39987000417. Its totient is φ = 9599695104.

The previous prime is 19669501469. The next prime is 19669501531. The reversal of 19669501504 is 40510596691.

It is a happy number.

The square root of 19669501504 is 140248.

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

It can be written as a sum of positive squares in only one way, i.e., 10691560000 + 8977941504 = 103400^2 + 94752^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 52733062 + ... + 52733434.

Almost surely, 2^19669501504 is an apocalyptic number.

19669501504 is the 140248-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19669501504

19669501504 is an abundant number, since it is smaller than the sum of its proper divisors (20317498913).

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

19669501504 is an frugal number, since it uses more digits than its factorization.

19669501504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852 (or 422 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 46.

The spelling of 19669501504 in words is "nineteen billion, six hundred sixty-nine million, five hundred one thousand, five hundred four".