45540564821 has 2 divisors, whose sum is σ = 45540564822. Its totient is φ = 45540564820.

The previous prime is 45540564779. The next prime is 45540564859. The reversal of 45540564821 is 12846504554.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34575543025 + 10965021796 = 185945^2 + 104714^2 .

It is a cyclic number.

It is not a de Polignac number, because 45540564821 - 2³⁴ = 28360695637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45540564221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22770282410 + 22770282411.

It is an arithmetic number, because the mean of its divisors is an integer number (22770282411).

Almost surely, 2^45540564821 is an apocalyptic number.

It is an amenable number.

45540564821 is a deficient number, since it is larger than the sum of its proper divisors (1).

45540564821 is an equidigital number, since it uses as much as digits as its factorization.

45540564821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768000, while the sum is 44.

The spelling of 45540564821 in words is "forty-five billion, five hundred forty million, five hundred sixty-four thousand, eight hundred twenty-one".