645377773546 has 32 divisors (see below), whose sum is σ = 1092541939776. Its totient is φ = 283364880000.

The previous prime is 645377773517. The next prime is 645377773643.

It is a happy number.

645377773546 is nontrivially palindromic in base 10.

645377773546 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3450960 + ... + 3633163.

It is an arithmetic number, because the mean of its divisors is an integer number (34141935618).

Almost surely, 2^645377773546 is an apocalyptic number.

645377773546 is a deficient number, since it is larger than the sum of its proper divisors (447164166230).

645377773546 is a wasteful number, since it uses less digits than its factorization.

645377773546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7084278.

The product of its digits is 311169600, while the sum is 64.

The spelling of 645377773546 in words is "six hundred forty-five billion, three hundred seventy-seven million, seven hundred seventy-three thousand, five hundred forty-six".