45151821821 has 2 divisors, whose sum is σ = 45151821822. Its totient is φ = 45151821820.

The previous prime is 45151821763. The next prime is 45151821839. The reversal of 45151821821 is 12812815154.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37108243225 + 8043578596 = 192635^2 + 89686^2 .

It is a cyclic number.

It is not a de Polignac number, because 45151821821 - 2¹⁴ = 45151805437 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45151821881) 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, 22575910910 + 22575910911.

It is an arithmetic number, because the mean of its divisors is an integer number (22575910911).

Almost surely, 2^45151821821 is an apocalyptic number.

It is an amenable number.

45151821821 is a deficient number, since it is larger than the sum of its proper divisors (1).

45151821821 is an equidigital number, since it uses as much as digits as its factorization.

45151821821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25600, while the sum is 38.

The spelling of 45151821821 in words is "forty-five billion, one hundred fifty-one million, eight hundred twenty-one thousand, eight hundred twenty-one".