645525411366 has 32 divisors (see below), whose sum is σ = 1408458038400. Its totient is φ = 195608350080.

The previous prime is 645525411361. The next prime is 645525411371. The reversal of 645525411366 is 663114525546.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (645525411361) and next prime (645525411371).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645525411361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2722830 + ... + 2950398.

It is an arithmetic number, because the mean of its divisors is an integer number (44014313700).

Almost surely, 2^645525411366 is an apocalyptic number.

645525411366 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

645525411366 is an abundant number, since it is smaller than the sum of its proper divisors (762932627034).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645525411366 is a wasteful number, since it uses less digits than its factorization.

645525411366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270564.

The product of its digits is 2592000, while the sum is 48.

The spelling of 645525411366 in words is "six hundred forty-five billion, five hundred twenty-five million, four hundred eleven thousand, three hundred sixty-six".