100640555 has 16 divisors (see below), whose sum is σ = 124371264. Its totient is φ = 78122880.

The previous prime is 100640543. The next prime is 100640557. The reversal of 100640555 is 555046001.

It is not a de Polignac number, because 100640555 - 2¹⁶ = 100575019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100640557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121874 + ... + 122696.

It is an arithmetic number, because the mean of its divisors is an integer number (7773204).

Almost surely, 2^100640555 is an apocalyptic number.

100640555 is a deficient number, since it is larger than the sum of its proper divisors (23730709).

100640555 is an equidigital number, since it uses as much as digits as its factorization.

100640555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1526.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 100640555 is about 10031.9766247734. The cubic root of 100640555 is about 465.1478390675.

Adding to 100640555 its reverse (555046001), we get a palindrome (655686556).

The spelling of 100640555 in words is "one hundred million, six hundred forty thousand, five hundred fifty-five".