19161425620 has 12 divisors (see below), whose sum is σ = 40238993844. Its totient is φ = 7664570240.

The previous prime is 19161425617. The next prime is 19161425651. The reversal of 19161425620 is 2652416191.

It can be written as a sum of positive squares in 2 ways, for example, as 13652520336 + 5508905284 = 116844^2 + 74222^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19161425620.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 479035621 + ... + 479035660.

It is an arithmetic number, because the mean of its divisors is an integer number (3353249487).

Almost surely, 2^19161425620 is an apocalyptic number.

19161425620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19161425620 is an abundant number, since it is smaller than the sum of its proper divisors (21077568224).

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

19161425620 is a wasteful number, since it uses less digits than its factorization.

19161425620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 958071290 (or 958071288 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

The spelling of 19161425620 in words is "nineteen billion, one hundred sixty-one million, four hundred twenty-five thousand, six hundred twenty".