72663553 has 2 divisors, whose sum is σ = 72663554. Its totient is φ = 72663552.

The previous prime is 72663533. The next prime is 72663587. The reversal of 72663553 is 35536627.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51022449 + 21641104 = 7143^2 + 4652^2 .

It is a cyclic number.

It is not a de Polignac number, because 72663553 - 2²¹ = 70566401 is a prime.

It is not a weakly prime, because it can be changed into another prime (72663533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36331776 + 36331777.

It is an arithmetic number, because the mean of its divisors is an integer number (36331777).

Almost surely, 2^72663553 is an apocalyptic number.

It is an amenable number.

72663553 is a deficient number, since it is larger than the sum of its proper divisors (1).

72663553 is an equidigital number, since it uses as much as digits as its factorization.

72663553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 113400, while the sum is 37.

The square root of 72663553 is about 8524.2919354044. The cubic root of 72663553 is about 417.2908639774.

The spelling of 72663553 in words is "seventy-two million, six hundred sixty-three thousand, five hundred fifty-three".