19015638972 has 96 divisors (see below), whose sum is σ = 49112469504. Its totient is φ = 5678270400.

The previous prime is 19015638931. The next prime is 19015639037. The reversal of 19015638972 is 27983651091.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4720023 + ... + 4724049.

It is an arithmetic number, because the mean of its divisors is an integer number (511588224).

Almost surely, 2^19015638972 is an apocalyptic number.

19015638972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19015638972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24556234752).

19015638972 is an abundant number, since it is smaller than the sum of its proper divisors (30096830532).

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

19015638972 is a wasteful number, since it uses less digits than its factorization.

19015638972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4559 (or 4557 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 51.

The spelling of 19015638972 in words is "nineteen billion, fifteen million, six hundred thirty-eight thousand, nine hundred seventy-two".