19145513908 has 12 divisors (see below), whose sum is σ = 33505622500. Its totient is φ = 9572478912.

The previous prime is 19145513903. The next prime is 19145513941. The reversal of 19145513908 is 80931554191.

It can be written as a sum of positive squares in 2 ways, for example, as 14551114384 + 4594399524 = 120628^2 + 67782^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19145513903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212968 + ... + 289216.

Almost surely, 2^19145513908 is an apocalyptic number.

It is an amenable number.

19145513908 is a deficient number, since it is larger than the sum of its proper divisors (14360108592).

19145513908 is a wasteful number, since it uses less digits than its factorization.

19145513908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139026 (or 139024 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 46.

The spelling of 19145513908 in words is "nineteen billion, one hundred forty-five million, five hundred thirteen thousand, nine hundred eight".