18982171950 has 96 divisors (see below), whose sum is σ = 56965711104. Its totient is φ = 4083555840.

The previous prime is 18982171921. The next prime is 18982171963. The reversal of 18982171950 is 5917128981.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 18982171893 and 18982171902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 513864 + ... + 549563.

It is an arithmetic number, because the mean of its divisors is an integer number (593392824).

Almost surely, 2^18982171950 is an apocalyptic number.

18982171950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18982171950 is an abundant number, since it is smaller than the sum of its proper divisors (37983539154).

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

18982171950 is a wasteful number, since it uses less digits than its factorization.

18982171950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063466 (or 1063461 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 51.

The spelling of 18982171950 in words is "eighteen billion, nine hundred eighty-two million, one hundred seventy-one thousand, nine hundred fifty".