645123484321546 has 16 divisors (see below), whose sum is σ = 969428193901344. Its totient is φ = 321980759773744.

The previous prime is 645123484321543. The next prime is 645123484321577.

645123484321546 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (645123484321543) 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, 200352021 + ... + 203546503.

It is an arithmetic number, because the mean of its divisors is an integer number (60589262118834).

Almost surely, 2^{645123484321546} is an apocalyptic number.

645123484321546 is a deficient number, since it is larger than the sum of its proper divisors (324304709579798).

645123484321546 is a wasteful number, since it uses less digits than its factorization.

645123484321546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3376325.

The product of its digits is 66355200, while the sum is 58.

The spelling of 645123484321546 in words is "six hundred forty-five trillion, one hundred twenty-three billion, four hundred eighty-four million, three hundred twenty-one thousand, five hundred forty-six".