19855647490950 has 72 divisors (see below), whose sum is σ = 53350206441168. Its totient is φ = 5294372811840.

The previous prime is 19855647490859. The next prime is 19855647490951. The reversal of 19855647490950 is 5909474655891.

19855647490950 is a `hidden beast` number, since 1 + 9 + 8 + 5 + 5 + 6 + 47 + 490 + 95 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19855647490951) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3184212 + ... + 7060488.

Almost surely, 2^{19855647490950} is an apocalyptic number.

19855647490950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19855647490950 is an abundant number, since it is smaller than the sum of its proper divisors (33494558950218).

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

19855647490950 is a wasteful number, since it uses less digits than its factorization.

19855647490950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3887678 (or 3887670 counting only the distinct ones).

The product of its (nonzero) digits is 489888000, while the sum is 72.

The spelling of 19855647490950 in words is "nineteen trillion, eight hundred fifty-five billion, six hundred forty-seven million, four hundred ninety thousand, nine hundred fifty".