72170663 has 2 divisors, whose sum is σ = 72170664. Its totient is φ = 72170662.

The previous prime is 72170621. The next prime is 72170669. The reversal of 72170663 is 36607127.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72170663 - 2⁶ = 72170599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72170669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36085331 + 36085332.

It is an arithmetic number, because the mean of its divisors is an integer number (36085332).

Almost surely, 2^72170663 is an apocalyptic number.

72170663 is a deficient number, since it is larger than the sum of its proper divisors (1).

72170663 is an equidigital number, since it uses as much as digits as its factorization.

72170663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 72170663 is about 8495.3318357790. The cubic root of 72170663 is about 416.3452027879.

The spelling of 72170663 in words is "seventy-two million, one hundred seventy thousand, six hundred sixty-three".