645525411361 has 2 divisors, whose sum is σ = 645525411362. Its totient is φ = 645525411360.

The previous prime is 645525411337. The next prime is 645525411371. The reversal of 645525411361 is 163114525546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 574419989025 + 71105422336 = 757905^2 + 266656^2 .

It is a cyclic number.

It is not a de Polignac number, because 645525411361 - 2²¹ = 645523314209 is a prime.

It is not a weakly prime, because it can be changed into another prime (645525411371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322762705680 + 322762705681.

It is an arithmetic number, because the mean of its divisors is an integer number (322762705681).

Almost surely, 2^645525411361 is an apocalyptic number.

It is an amenable number.

645525411361 is a deficient number, since it is larger than the sum of its proper divisors (1).

645525411361 is an equidigital number, since it uses as much as digits as its factorization.

645525411361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432000, while the sum is 43.

The spelling of 645525411361 in words is "six hundred forty-five billion, five hundred twenty-five million, four hundred eleven thousand, three hundred sixty-one".