19215166040 has 128 divisors (see below), whose sum is σ = 50863472640. Its totient is φ = 6396558336.

The previous prime is 19215166027. The next prime is 19215166049. The reversal of 19215166040 is 4066151291.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19215166049) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1665572 + ... + 1677068.

It is an arithmetic number, because the mean of its divisors is an integer number (397370880).

Almost surely, 2^19215166040 is an apocalyptic number.

19215166040 is a gapful number since it is divisible by the number (10) 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 19215166040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25431736320).

19215166040 is an abundant number, since it is smaller than the sum of its proper divisors (31648306600).

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

19215166040 is a wasteful number, since it uses less digits than its factorization.

19215166040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11689 (or 11685 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 35.

The spelling of 19215166040 in words is "nineteen billion, two hundred fifteen million, one hundred sixty-six thousand, forty".