19558740012 has 48 divisors (see below), whose sum is σ = 53040664320. Its totient is φ = 5493494592.

The previous prime is 19558739971. The next prime is 19558740067. The reversal of 19558740012 is 21004785591.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 1968283 + ... + 1978194.

It is an arithmetic number, because the mean of its divisors is an integer number (1105013840).

Almost surely, 2^19558740012 is an apocalyptic number.

19558740012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19558740012 is an abundant number, since it is smaller than the sum of its proper divisors (33481924308).

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

19558740012 is a wasteful number, since it uses less digits than its factorization.

19558740012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3946550 (or 3946548 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 42.

The spelling of 19558740012 in words is "nineteen billion, five hundred fifty-eight million, seven hundred forty thousand, twelve".