101663643 has 4 divisors (see below), whose sum is σ = 135551528. Its totient is φ = 67775760.

The previous prime is 101663633. The next prime is 101663651. The reversal of 101663643 is 346366101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346366101 = 3 ⋅115455367.

It is not a de Polignac number, because 101663643 - 2¹⁰ = 101662619 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 101663643.

It is not an unprimeable number, because it can be changed into a prime (101663603) 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, 16943938 + ... + 16943943.

It is an arithmetic number, because the mean of its divisors is an integer number (33887882).

Almost surely, 2^101663643 is an apocalyptic number.

101663643 is a deficient number, since it is larger than the sum of its proper divisors (33887885).

101663643 is an equidigital number, since it uses as much as digits as its factorization.

101663643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33887884.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 101663643 is about 10082.8390347164. The cubic root of 101663643 is about 466.7187221410.

The spelling of 101663643 in words is "one hundred one million, six hundred sixty-three thousand, six hundred forty-three".