100666553 has 4 divisors (see below), whose sum is σ = 108410148. Its totient is φ = 92922960.

The previous prime is 100666547. The next prime is 100666583. The reversal of 100666553 is 355666001.

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 10549504 + 90117049 = 3248^2 + 9493^2 .

It is not a de Polignac number, because 100666553 - 2¹⁰ = 100665529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100666513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3871778 + ... + 3871803.

It is an arithmetic number, because the mean of its divisors is an integer number (27102537).

Almost surely, 2^100666553 is an apocalyptic number.

100666553 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

100666553 is a deficient number, since it is larger than the sum of its proper divisors (7743595).

100666553 is an equidigital number, since it uses as much as digits as its factorization.

100666553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7743594.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 100666553 is about 10033.2722977103. The cubic root of 100666553 is about 465.1878887684.

The spelling of 100666553 in words is "one hundred million, six hundred sixty-six thousand, five hundred fifty-three".