645577267260 has 48 divisors (see below), whose sum is σ = 1849653945216. Its totient is φ = 168150357312.

The previous prime is 645577267259. The next prime is 645577267261. The reversal of 645577267260 is 62762775546.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (645577267259) and next prime (645577267261).

It is a self number, because there is not a number n which added to its sum of digits gives 645577267260.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645577267261) 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, 125109294 + ... + 125114453.

It is an arithmetic number, because the mean of its divisors is an integer number (38534457192).

Almost surely, 2^645577267260 is an apocalyptic number.

645577267260 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

645577267260 is an abundant number, since it is smaller than the sum of its proper divisors (1204076677956).

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

645577267260 is a wasteful number, since it uses less digits than its factorization.

645577267260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250223802 (or 250223800 counting only the distinct ones).

The product of its (nonzero) digits is 29635200, while the sum is 57.

The spelling of 645577267260 in words is "six hundred forty-five billion, five hundred seventy-seven million, two hundred sixty-seven thousand, two hundred sixty".