19871617652 has 12 divisors (see below), whose sum is σ = 34794545856. Its totient is φ = 9930318840.

The previous prime is 19871617651. The next prime is 19871617663. The reversal of 19871617652 is 25671617891.

It is a junction number, because it is equal to n+sod(n) for n = 19871617594 and 19871617603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19871617651) 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, 1364348 + ... + 1378835.

It is an arithmetic number, because the mean of its divisors is an integer number (2899545488).

Almost surely, 2^19871617652 is an apocalyptic number.

It is an amenable number.

19871617652 is a deficient number, since it is larger than the sum of its proper divisors (14922928204).

19871617652 is a wasteful number, since it uses less digits than its factorization.

19871617652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2744998 (or 2744996 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 53.

The spelling of 19871617652 in words is "nineteen billion, eight hundred seventy-one million, six hundred seventeen thousand, six hundred fifty-two".