45155507821 has 2 divisors, whose sum is σ = 45155507822. Its totient is φ = 45155507820.

The previous prime is 45155507783. The next prime is 45155507843. The reversal of 45155507821 is 12870555154.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41703357796 + 3452150025 = 204214^2 + 58755^2 .

It is a cyclic number.

It is not a de Polignac number, because 45155507821 - 2⁷ = 45155507693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45155508821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22577753910 + 22577753911.

It is an arithmetic number, because the mean of its divisors is an integer number (22577753911).

Almost surely, 2^45155507821 is an apocalyptic number.

It is an amenable number.

45155507821 is a deficient number, since it is larger than the sum of its proper divisors (1).

45155507821 is an equidigital number, since it uses as much as digits as its factorization.

45155507821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280000, while the sum is 43.

The spelling of 45155507821 in words is "forty-five billion, one hundred fifty-five million, five hundred seven thousand, eight hundred twenty-one".