645415002266 has 4 divisors (see below), whose sum is σ = 968122503402. Its totient is φ = 322707501132.

The previous prime is 645415002191. The next prime is 645415002299. The reversal of 645415002266 is 662200514546.

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., 556806978025 + 88608024241 = 746195^2 + 297671^2 .

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 as a sum of consecutive naturals, namely, 161353750565 + ... + 161353750568.

Almost surely, 2^645415002266 is an apocalyptic number.

645415002266 is a deficient number, since it is larger than the sum of its proper divisors (322707501136).

645415002266 is a wasteful number, since it uses less digits than its factorization.

645415002266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322707501135.

The product of its (nonzero) digits is 345600, while the sum is 41.

The spelling of 645415002266 in words is "six hundred forty-five billion, four hundred fifteen million, two thousand, two hundred sixty-six".