645335424533546 has 4 divisors (see below), whose sum is σ = 968003136800322. Its totient is φ = 322667712266772.

The previous prime is 645335424533539. The next prime is 645335424533627.

645335424533546 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 635546066381521 + 9789358152025 = 25210039^2 + 3128795^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161333856133385 + ... + 161333856133388.

Almost surely, 2^{645335424533546} is an apocalyptic number.

645335424533546 is a deficient number, since it is larger than the sum of its proper divisors (322667712266776).

645335424533546 is a wasteful number, since it uses less digits than its factorization.

645335424533546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322667712266775.

The product of its digits is 933120000, while the sum is 62.

The spelling of 645335424533546 in words is "six hundred forty-five trillion, three hundred thirty-five billion, four hundred twenty-four million, five hundred thirty-three thousand, five hundred forty-six".