71572663 has 2 divisors, whose sum is σ = 71572664. Its totient is φ = 71572662.

The previous prime is 71572651. The next prime is 71572673. The reversal of 71572663 is 36627517.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71572663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71572603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35786331 + 35786332.

It is an arithmetic number, because the mean of its divisors is an integer number (35786332).

Almost surely, 2^71572663 is an apocalyptic number.

71572663 is a deficient number, since it is larger than the sum of its proper divisors (1).

71572663 is an equidigital number, since it uses as much as digits as its factorization.

71572663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 37.

The square root of 71572663 is about 8460.0628248258. The cubic root of 71572663 is about 415.1920783080.

The spelling of 71572663 in words is "seventy-one million, five hundred seventy-two thousand, six hundred sixty-three".