100105500505491 has 40 divisors (see below), whose sum is σ = 161685024432624. Its totient is φ = 61357952952000.

The previous prime is 100105500505487. The next prime is 100105500505501. The reversal of 100105500505491 is 194505005501001.

100105500505491 is a `hidden beast` number, since 1 + 0 + 0 + 1 + 0 + 550 + 0 + 50 + 54 + 9 + 1 = 666.

It is not a de Polignac number, because 100105500505491 - 2² = 100105500505487 is a prime.

It is a super-2 number, since 2×100105500505491² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (100105500505411) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 189112096 + ... + 189640701.

Almost surely, 2^{100105500505491} is an apocalyptic number.

100105500505491 is a deficient number, since it is larger than the sum of its proper divisors (61579523927133).

100105500505491 is a wasteful number, since it uses less digits than its factorization.

100105500505491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378753073 (or 378753064 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 36.

The spelling of 100105500505491 in words is "one hundred trillion, one hundred five billion, five hundred million, five hundred five thousand, four hundred ninety-one".