72553553 has 2 divisors, whose sum is σ = 72553554. Its totient is φ = 72553552.

The previous prime is 72553543. The next prime is 72553567. The reversal of 72553553 is 35535527.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71436304 + 1117249 = 8452^2 + 1057^2 .

It is a cyclic number.

It is not a de Polignac number, because 72553553 - 2¹² = 72549457 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (72553543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36276776 + 36276777.

It is an arithmetic number, because the mean of its divisors is an integer number (36276777).

Almost surely, 2^72553553 is an apocalyptic number.

It is an amenable number.

72553553 is a deficient number, since it is larger than the sum of its proper divisors (1).

72553553 is an equidigital number, since it uses as much as digits as its factorization.

72553553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 78750, while the sum is 35.

The square root of 72553553 is about 8517.8373428940. The cubic root of 72553553 is about 417.0801890003.

The spelling of 72553553 in words is "seventy-two million, five hundred fifty-three thousand, five hundred fifty-three".