19218363540 has 48 divisors (see below), whose sum is σ = 54693582720. Its totient is φ = 5040881280.

The previous prime is 19218363533. The next prime is 19218363553. The reversal of 19218363540 is 4536381291.

It is a junction number, because it is equal to n+sod(n) for n = 19218363492 and 19218363501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2621800 + ... + 2629119.

It is an arithmetic number, because the mean of its divisors is an integer number (1139449640).

Almost surely, 2^19218363540 is an apocalyptic number.

19218363540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19218363540 is an abundant number, since it is smaller than the sum of its proper divisors (35475219180).

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

19218363540 is a wasteful number, since it uses less digits than its factorization.

19218363540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5250992 (or 5250990 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 19218363540 in words is "nineteen billion, two hundred eighteen million, three hundred sixty-three thousand, five hundred forty".