645539935546 has 16 divisors (see below), whose sum is σ = 1056504840768. Its totient is φ = 293380920000.

The previous prime is 645539935543. The next prime is 645539935637.

645539935546 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (645539935543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2173455 + ... + 2452546.

It is an arithmetic number, because the mean of its divisors is an integer number (66031552548).

Almost surely, 2^645539935546 is an apocalyptic number.

645539935546 is a deficient number, since it is larger than the sum of its proper divisors (410964905222).

645539935546 is a wasteful number, since it uses less digits than its factorization.

645539935546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4632357.

The product of its digits is 262440000, while the sum is 64.

The spelling of 645539935546 in words is "six hundred forty-five billion, five hundred thirty-nine million, nine hundred thirty-five thousand, five hundred forty-six".