72423563647 has 2 divisors, whose sum is σ = 72423563648. Its totient is φ = 72423563646.

The previous prime is 72423563609. The next prime is 72423563651. The reversal of 72423563647 is 74636532427.

It is a strong prime.

It is an emirp because it is prime and its reverse (74636532427) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72423563647 - 2²³ = 72415175039 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72423563647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72423513647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36211781823 + 36211781824.

It is an arithmetic number, because the mean of its divisors is an integer number (36211781824).

Almost surely, 2^72423563647 is an apocalyptic number.

72423563647 is a deficient number, since it is larger than the sum of its proper divisors (1).

72423563647 is an equidigital number, since it uses as much as digits as its factorization.

72423563647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5080320, while the sum is 49.

The spelling of 72423563647 in words is "seventy-two billion, four hundred twenty-three million, five hundred sixty-three thousand, six hundred forty-seven".