72191663 has 2 divisors, whose sum is σ = 72191664. Its totient is φ = 72191662.

The previous prime is 72191627. The next prime is 72191683. The reversal of 72191663 is 36619127.

It is a strong prime.

It is an emirp because it is prime and its reverse (36619127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72191663 - 2⁸ = 72191407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72191683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36095831 + 36095832.

It is an arithmetic number, because the mean of its divisors is an integer number (36095832).

Almost surely, 2^72191663 is an apocalyptic number.

72191663 is a deficient number, since it is larger than the sum of its proper divisors (1).

72191663 is an equidigital number, since it uses as much as digits as its factorization.

72191663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 35.

The square root of 72191663 is about 8496.5677187909. The cubic root of 72191663 is about 416.3855811587.

The spelling of 72191663 in words is "seventy-two million, one hundred ninety-one thousand, six hundred sixty-three".