100644563 has 4 divisors (see below), whose sum is σ = 100690968. Its totient is φ = 100598160.

The previous prime is 100644497. The next prime is 100644601. The reversal of 100644563 is 365446001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 365446001 = 1163 ⋅314227.

It is a cyclic number.

It is not a de Polignac number, because 100644563 - 2¹⁴ = 100628179 is a prime.

It is a super-2 number, since 2×100644563² = 20258656122921938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100644163) 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, 19781 + ... + 24342.

It is an arithmetic number, because the mean of its divisors is an integer number (25172742).

Almost surely, 2^100644563 is an apocalyptic number.

100644563 is a deficient number, since it is larger than the sum of its proper divisors (46405).

100644563 is an equidigital number, since it uses as much as digits as its factorization.

100644563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46404.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 100644563 is about 10032.1763840156. The cubic root of 100644563 is about 465.1540138075.

The spelling of 100644563 in words is "one hundred million, six hundred forty-four thousand, five hundred sixty-three".