645431134546 has 32 divisors (see below), whose sum is σ = 1069880260032. Its totient is φ = 289586420160.

The previous prime is 645431134511. The next prime is 645431134553.

645431134546 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×645431134546² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645431134496 and 645431134505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157140 + ... + 1146976.

It is an arithmetic number, because the mean of its divisors is an integer number (33433758126).

Almost surely, 2^645431134546 is an apocalyptic number.

645431134546 is a deficient number, since it is larger than the sum of its proper divisors (424449125486).

645431134546 is a wasteful number, since it uses less digits than its factorization.

645431134546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990234.

The product of its digits is 2073600, while the sum is 46.

It can be divided in two parts, 645431 and 134546, that added together give a palindrome (779977).

The spelling of 645431134546 in words is "six hundred forty-five billion, four hundred thirty-one million, one hundred thirty-four thousand, five hundred forty-six".