645467764546 has 16 divisors (see below), whose sum is σ = 1066677605568. Its totient is φ = 290489542000.

The previous prime is 645467764541. The next prime is 645467764559.

It is a happy number.

645467764546 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×645467764546² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645467764541) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 145242550 + ... + 145246993.

It is an arithmetic number, because the mean of its divisors is an integer number (66667350348).

Almost surely, 2^645467764546 is an apocalyptic number.

645467764546 is a deficient number, since it is larger than the sum of its proper divisors (421209841022).

645467764546 is a wasteful number, since it uses less digits than its factorization.

645467764546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290489657.

The product of its digits is 406425600, while the sum is 64.

The spelling of 645467764546 in words is "six hundred forty-five billion, four hundred sixty-seven million, seven hundred sixty-four thousand, five hundred forty-six".