100405206445 has 4 divisors (see below), whose sum is σ = 120486247740. Its totient is φ = 80324165152.

The previous prime is 100405206397. The next prime is 100405206481. The reversal of 100405206445 is 544602504001.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23954062441 + 76451144004 = 154771^2 + 276498^2 .

It is a cyclic number.

It is not a de Polignac number, because 100405206445 - 2⁹ = 100405205933 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10040520640 + ... + 10040520649.

It is an arithmetic number, because the mean of its divisors is an integer number (30121561935).

Almost surely, 2^100405206445 is an apocalyptic number.

It is an amenable number.

100405206445 is a deficient number, since it is larger than the sum of its proper divisors (20081041295).

100405206445 is an equidigital number, since it uses as much as digits as its factorization.

100405206445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20081041294.

The product of its (nonzero) digits is 19200, while the sum is 31.

The spelling of 100405206445 in words is "one hundred billion, four hundred five million, two hundred six thousand, four hundred forty-five".