18929686550 has 192 divisors, whose sum is σ = 39604322304. Its totient is φ = 6706022400.

The previous prime is 18929686549. The next prime is 18929686553. The reversal of 18929686550 is 5568692981.

It is a self number, because there is not a number n which added to its sum of digits gives 18929686550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18929686553) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 149052587 + ... + 149052713.

It is an arithmetic number, because the mean of its divisors is an integer number (206272512).

Almost surely, 2^18929686550 is an apocalyptic number.

18929686550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18929686550 is an abundant number, since it is smaller than the sum of its proper divisors (20674635754).

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

18929686550 is a wasteful number, since it uses less digits than its factorization.

18929686550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343 (or 338 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 59.

The spelling of 18929686550 in words is "eighteen billion, nine hundred twenty-nine million, six hundred eighty-six thousand, five hundred fifty".