22537073521 has 2 divisors, whose sum is σ = 22537073522. Its totient is φ = 22537073520.

The previous prime is 22537073509. The next prime is 22537073551. The reversal of 22537073521 is 12537073522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17081183025 + 5455890496 = 130695^2 + 73864^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22537073521 is a prime.

It is not a weakly prime, because it can be changed into another prime (22537073551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11268536760 + 11268536761.

It is an arithmetic number, because the mean of its divisors is an integer number (11268536761).

Almost surely, 2^22537073521 is an apocalyptic number.

It is an amenable number.

22537073521 is a deficient number, since it is larger than the sum of its proper divisors (1).

22537073521 is an equidigital number, since it uses as much as digits as its factorization.

22537073521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 88200, while the sum is 37.

Subtracting from 22537073521 its reverse (12537073522), we obtain a palindrome (9999999999).

The spelling of 22537073521 in words is "twenty-two billion, five hundred thirty-seven million, seventy-three thousand, five hundred twenty-one".