645525411371 has 2 divisors, whose sum is σ = 645525411372. Its totient is φ = 645525411370.

The previous prime is 645525411361. The next prime is 645525411383. The reversal of 645525411371 is 173114525546.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645525411371 - 2²² = 645521217067 is a prime.

It is not a weakly prime, because it can be changed into another prime (645525411361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322762705685 + 322762705686.

It is an arithmetic number, because the mean of its divisors is an integer number (322762705686).

Almost surely, 2^645525411371 is an apocalyptic number.

645525411371 is a deficient number, since it is larger than the sum of its proper divisors (1).

645525411371 is an equidigital number, since it uses as much as digits as its factorization.

645525411371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504000, while the sum is 44.

The spelling of 645525411371 in words is "six hundred forty-five billion, five hundred twenty-five million, four hundred eleven thousand, three hundred seventy-one".