19908641925 has 18 divisors (see below), whose sum is σ = 35658590162. Its totient is φ = 10617942240.

The previous prime is 19908641917. The next prime is 19908641927. The reversal of 19908641925 is 52914680991.

It can be written as a sum of positive squares in 3 ways, for example, as 146748996 + 19761892929 = 12114^2 + 140577^2 .

It is not a de Polignac number, because 19908641925 - 2³ = 19908641917 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19908641927) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 44241202 + ... + 44241651.

Almost surely, 2^19908641925 is an apocalyptic number.

19908641925 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19908641925 is a deficient number, since it is larger than the sum of its proper divisors (15749948237).

19908641925 is a wasteful number, since it uses less digits than its factorization.

19908641925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88482869 (or 88482861 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 54.

The spelling of 19908641925 in words is "nineteen billion, nine hundred eight million, six hundred forty-one thousand, nine hundred twenty-five".