72651563 has 2 divisors, whose sum is σ = 72651564. Its totient is φ = 72651562.

The previous prime is 72651559. The next prime is 72651617. The reversal of 72651563 is 36515627.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72651563 - 2² = 72651559 is a prime.

It is not a weakly prime, because it can be changed into another prime (72651533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36325781 + 36325782.

It is an arithmetic number, because the mean of its divisors is an integer number (36325782).

Almost surely, 2^72651563 is an apocalyptic number.

72651563 is a deficient number, since it is larger than the sum of its proper divisors (1).

72651563 is an equidigital number, since it uses as much as digits as its factorization.

72651563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37800, while the sum is 35.

The square root of 72651563 is about 8523.5886221708. The cubic root of 72651563 is about 417.2679107338.

The spelling of 72651563 in words is "seventy-two million, six hundred fifty-one thousand, five hundred sixty-three".