72100663 has 4 divisors (see below), whose sum is σ = 72503640. Its totient is φ = 71697688.

The previous prime is 72100631. The next prime is 72100681. The reversal of 72100663 is 36600127.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72100663 - 2⁵ = 72100631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72109663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201220 + ... + 201577.

It is an arithmetic number, because the mean of its divisors is an integer number (18125910).

Almost surely, 2^72100663 is an apocalyptic number.

72100663 is a deficient number, since it is larger than the sum of its proper divisors (402977).

72100663 is a wasteful number, since it uses less digits than its factorization.

72100663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402976.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 72100663 is about 8491.2109265993. The cubic root of 72100663 is about 416.2105516217.

The spelling of 72100663 in words is "seventy-two million, one hundred thousand, six hundred sixty-three".