19869505148 has 12 divisors (see below), whose sum is σ = 34779782520. Its totient is φ = 9932424432.

The previous prime is 19869505133. The next prime is 19869505169. The reversal of 19869505148 is 84150596891.

It is a junction number, because it is equal to n+sod(n) for n = 19869505093 and 19869505102.

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, 562763 + ... + 597026.

It is an arithmetic number, because the mean of its divisors is an integer number (2898315210).

Almost surely, 2^19869505148 is an apocalyptic number.

It is an amenable number.

19869505148 is a deficient number, since it is larger than the sum of its proper divisors (14910277372).

19869505148 is a wasteful number, since it uses less digits than its factorization.

19869505148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164076 (or 1164074 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 56.

The spelling of 19869505148 in words is "nineteen billion, eight hundred sixty-nine million, five hundred five thousand, one hundred forty-eight".