645018810546 has 32 divisors (see below), whose sum is σ = 1407349608768. Its totient is φ = 195455267840.

The previous prime is 645018810533. The next prime is 645018810587.

645018810546 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 645018810495 and 645018810504.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3124546 + ... + 3324578.

It is an arithmetic number, because the mean of its divisors is an integer number (43979675274).

Almost surely, 2^645018810546 is an apocalyptic number.

645018810546 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

645018810546 is an abundant number, since it is smaller than the sum of its proper divisors (762330798222).

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

645018810546 is a wasteful number, since it uses less digits than its factorization.

645018810546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248906.

The product of its (nonzero) digits is 921600, while the sum is 48.

The spelling of 645018810546 in words is "six hundred forty-five billion, eighteen million, eight hundred ten thousand, five hundred forty-six".