19901018136 has 64 divisors (see below), whose sum is σ = 49963392000. Its totient is φ = 6605625600.

The previous prime is 19901018119. The next prime is 19901018153. The reversal of 19901018136 is 63181010991.

It is an interprime number because it is at equal distance from previous prime (19901018119) and next prime (19901018153).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 19901018094 and 19901018103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6525540 + ... + 6528588.

It is an arithmetic number, because the mean of its divisors is an integer number (780678000).

Almost surely, 2^19901018136 is an apocalyptic number.

It is an amenable number.

19901018136 is an abundant number, since it is smaller than the sum of its proper divisors (30062373864).

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

19901018136 is a wasteful number, since it uses less digits than its factorization.

19901018136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4120 (or 4116 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 39.

The spelling of 19901018136 in words is "nineteen billion, nine hundred one million, eighteen thousand, one hundred thirty-six".