645222146 has 8 divisors (see below), whose sum is σ = 968579904. Its totient is φ = 322362180.

The previous prime is 645222139. The next prime is 645222161. The reversal of 645222146 is 641222546.

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

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, 121190 + ... + 126401.

It is an arithmetic number, because the mean of its divisors is an integer number (121072488).

Almost surely, 2^645222146 is an apocalyptic number.

645222146 is a deficient number, since it is larger than the sum of its proper divisors (323357758).

645222146 is a wasteful number, since it uses less digits than its factorization.

645222146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248896.

The product of its digits is 23040, while the sum is 32.

The square root of 645222146 is about 25401.2233169979. The cubic root of 645222146 is about 864.1114405652. Note that the first 3 decimals are identical.

The spelling of 645222146 in words is "six hundred forty-five million, two hundred twenty-two thousand, one hundred forty-six".