645194491546 has 8 divisors (see below), whose sum is σ = 1055772804384. Its totient is φ = 293270223420.

The previous prime is 645194491511. The next prime is 645194491553.

645194491546 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14663511150 + ... + 14663511193.

It is an arithmetic number, because the mean of its divisors is an integer number (131971600548).

Almost surely, 2^645194491546 is an apocalyptic number.

645194491546 is a deficient number, since it is larger than the sum of its proper divisors (410578312838).

645194491546 is a wasteful number, since it uses less digits than its factorization.

645194491546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29327022356.

The product of its digits is 18662400, while the sum is 58.

The spelling of 645194491546 in words is "six hundred forty-five billion, one hundred ninety-four million, four hundred ninety-one thousand, five hundred forty-six".