81472663 has 2 divisors, whose sum is σ = 81472664. Its totient is φ = 81472662.

The previous prime is 81472639. The next prime is 81472669. The reversal of 81472663 is 36627418.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81472663 - 2²⁵ = 47918231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81472669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40736331 + 40736332.

It is an arithmetic number, because the mean of its divisors is an integer number (40736332).

Almost surely, 2^81472663 is an apocalyptic number.

81472663 is a deficient number, since it is larger than the sum of its proper divisors (1).

81472663 is an equidigital number, since it uses as much as digits as its factorization.

81472663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 37.

The square root of 81472663 is about 9026.2208592522. The cubic root of 81472663 is about 433.5148418446.

The spelling of 81472663 in words is "eighty-one million, four hundred seventy-two thousand, six hundred sixty-three".