100191954550 has 24 divisors (see below), whose sum is σ = 188202164112. Its totient is φ = 39679980000.

The previous prime is 100191954517. The next prime is 100191954559. The reversal of 100191954550 is 55459191001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100191954559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9914946 + ... + 9925045.

It is an arithmetic number, because the mean of its divisors is an integer number (7841756838).

Almost surely, 2^100191954550 is an apocalyptic number.

100191954550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

100191954550 is a deficient number, since it is larger than the sum of its proper divisors (88010209562).

100191954550 is a wasteful number, since it uses less digits than its factorization.

100191954550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19840104 (or 19840099 counting only the distinct ones).

The product of its (nonzero) digits is 40500, while the sum is 40.

The spelling of 100191954550 in words is "one hundred billion, one hundred ninety-one million, nine hundred fifty-four thousand, five hundred fifty".