19869157764 has 135 divisors (see below), whose sum is σ = 53519879413. Its totient is φ = 6427684800.

The previous prime is 19869157703. The next prime is 19869157771. The reversal of 19869157764 is 46775196891.

The square root of 19869157764 is 140958.

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., 957407364 + 18911750400 = 30942^2 + 137520^2 .

It is a Duffinian number.

Its product of digits (22861440) is a multiple of the sum of its prime factors (480).

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 104026909 + ... + 104027099.

Almost surely, 2^19869157764 is an apocalyptic number.

19869157764 is the 140958-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19869157764

19869157764 is an abundant number, since it is smaller than the sum of its proper divisors (33650721649).

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

19869157764 is an equidigital number, since it uses as much as digits as its factorization.

19869157764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480 (or 237 counting only the distinct ones).

The product of its digits is 22861440, while the sum is 63.

The spelling of 19869157764 in words is "nineteen billion, eight hundred sixty-nine million, one hundred fifty-seven thousand, seven hundred sixty-four".