19425844278 has 72 divisors (see below), whose sum is σ = 45102703464. Its totient is φ = 6266250720.

The previous prime is 19425844261. The next prime is 19425844301. The reversal of 19425844278 is 87244852491.

19425844278 is a `hidden beast` number, since 19 + 4 + 2 + 584 + 42 + 7 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 446250 + ... + 487842.

It is an arithmetic number, because the mean of its divisors is an integer number (626426437).

Almost surely, 2^19425844278 is an apocalyptic number.

19425844278 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19425844278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22551351732).

19425844278 is an abundant number, since it is smaller than the sum of its proper divisors (25676859186).

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

19425844278 is an equidigital number, since it uses as much as digits as its factorization.

19425844278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41672 (or 41629 counting only the distinct ones).

The product of its digits is 5160960, while the sum is 54.

The spelling of 19425844278 in words is "nineteen billion, four hundred twenty-five million, eight hundred forty-four thousand, two hundred seventy-eight".