645221121122546 has 8 divisors (see below), whose sum is σ = 967856710419180. Its totient is φ = 322602217649488.

The previous prime is 645221121122527. The next prime is 645221121122569.

645221121122546 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 496572867727225 + 148648253395321 = 22283915^2 + 12192139^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 645221121122497 and 645221121122506.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4171359221 + ... + 4171513896.

Almost surely, 2^{645221121122546} is an apocalyptic number.

645221121122546 is a deficient number, since it is larger than the sum of its proper divisors (322635589296634).

645221121122546 is a wasteful number, since it uses less digits than its factorization.

645221121122546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8342911788.

The product of its digits is 460800, while the sum is 44.

The spelling of 645221121122546 in words is "six hundred forty-five trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred twenty-two thousand, five hundred forty-six".