645244442546 has 32 divisors (see below), whose sum is σ = 1059897313728. Its totient is φ = 292171127040.

The previous prime is 645244442543. The next prime is 645244442587.

It is a happy number.

645244442546 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 645244442494 and 645244442503.

It is not an unprimeable number, because it can be changed into a prime (645244442543) 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, 11174726 + ... + 11232318.

It is an arithmetic number, because the mean of its divisors is an integer number (33121791054).

Almost surely, 2^645244442546 is an apocalyptic number.

645244442546 is a deficient number, since it is larger than the sum of its proper divisors (414652871182).

645244442546 is a wasteful number, since it uses less digits than its factorization.

645244442546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59546.

The product of its digits is 14745600, while the sum is 50.

The spelling of 645244442546 in words is "six hundred forty-five billion, two hundred forty-four million, four hundred forty-two thousand, five hundred forty-six".