100105110105550 has 72 divisors (see below), whose sum is σ = 208130008905000. Its totient is φ = 35784877444800.

The previous prime is 100105110105529. The next prime is 100105110105569. The reversal of 100105110105550 is 55501011501001.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 139865925 + ... + 140579824.

It is an arithmetic number, because the mean of its divisors is an integer number (2890694568125).

Almost surely, 2^{100105110105550} is an apocalyptic number.

100105110105550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

100105110105550 is an abundant number, since it is smaller than the sum of its proper divisors (108024898799450).

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

100105110105550 is a wasteful number, since it uses less digits than its factorization.

100105110105550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280445842 (or 280445826 counting only the distinct ones).

The product of its (nonzero) digits is 625, while the sum is 25.

Adding to 100105110105550 its reverse (55501011501001), we get a palindrome (155606121606551).

The spelling of 100105110105550 in words is "one hundred trillion, one hundred five billion, one hundred ten million, one hundred five thousand, five hundred fifty".