19079809854 has 64 divisors (see below), whose sum is σ = 44175352320. Its totient is φ = 5381038080.

The previous prime is 19079809849. The next prime is 19079809883. The reversal of 19079809854 is 45890897091.

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, 2392077 + ... + 2400039.

It is an arithmetic number, because the mean of its divisors is an integer number (690239880).

Almost surely, 2^19079809854 is an apocalyptic number.

19079809854 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19079809854, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22087676160).

19079809854 is an abundant number, since it is smaller than the sum of its proper divisors (25095542466).

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

19079809854 is a wasteful number, since it uses less digits than its factorization.

19079809854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8705.

The product of its (nonzero) digits is 6531840, while the sum is 60.

The spelling of 19079809854 in words is "nineteen billion, seventy-nine million, eight hundred nine thousand, eight hundred fifty-four".