645252252546 has 64 divisors (see below), whose sum is σ = 1467836743680. Its totient is φ = 187301943360.

The previous prime is 645252252539. The next prime is 645252252551.

645252252546 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 645252252495 and 645252252504.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1084176 + ... + 1570331.

It is an arithmetic number, because the mean of its divisors is an integer number (22934949120).

Almost surely, 2^645252252546 is an apocalyptic number.

645252252546 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

645252252546 is an abundant number, since it is smaller than the sum of its proper divisors (822584491134).

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

645252252546 is a wasteful number, since it uses less digits than its factorization.

645252252546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2654679.

The product of its digits is 5760000, while the sum is 48.

It can be divided in two parts, 645252 and 252546, that added together give a palindrome (897798).

The spelling of 645252252546 in words is "six hundred forty-five billion, two hundred fifty-two million, two hundred fifty-two thousand, five hundred forty-six".