163642660633 has 4 divisors (see below), whose sum is σ = 163663945488. Its totient is φ = 163621375780.

The previous prime is 163642660619. The next prime is 163642660651. The reversal of 163642660633 is 336066246361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 163642660633 - 2²⁵ = 163609106201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163642660673) 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, 10630891 + ... + 10646272.

It is an arithmetic number, because the mean of its divisors is an integer number (40915986372).

Almost surely, 2^163642660633 is an apocalyptic number.

It is an amenable number.

163642660633 is a deficient number, since it is larger than the sum of its proper divisors (21284855).

163642660633 is an equidigital number, since it uses as much as digits as its factorization.

163642660633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21284854.

The product of its (nonzero) digits is 1679616, while the sum is 46.

The spelling of 163642660633 in words is "one hundred sixty-three billion, six hundred forty-two million, six hundred sixty thousand, six hundred thirty-three".