80521633 has 2 divisors, whose sum is σ = 80521634. Its totient is φ = 80521632.

The previous prime is 80521631. The next prime is 80521687. The reversal of 80521633 is 33612508.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43652449 + 36869184 = 6607^2 + 6072^2 .

It is a cyclic number.

It is not a de Polignac number, because 80521633 - 2¹ = 80521631 is a prime.

Together with 80521631, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (80521631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40260816 + 40260817.

It is an arithmetic number, because the mean of its divisors is an integer number (40260817).

Almost surely, 2^80521633 is an apocalyptic number.

It is an amenable number.

80521633 is a deficient number, since it is larger than the sum of its proper divisors (1).

80521633 is an equidigital number, since it uses as much as digits as its factorization.

80521633 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 80521633 is about 8973.3847014379. The cubic root of 80521633 is about 431.8214300409.

The spelling of 80521633 in words is "eighty million, five hundred twenty-one thousand, six hundred thirty-three".