645418162 has 4 divisors (see below), whose sum is σ = 968127246. Its totient is φ = 322709080.

The previous prime is 645418159. The next prime is 645418177. The reversal of 645418162 is 261814546.

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., 382945761 + 262472401 = 19569^2 + 16201^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161354539 + ... + 161354542.

Almost surely, 2^645418162 is an apocalyptic number.

645418162 is a deficient number, since it is larger than the sum of its proper divisors (322709084).

645418162 is a wasteful number, since it uses less digits than its factorization.

645418162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322709083.

The product of its digits is 46080, while the sum is 37.

The square root of 645418162 is about 25405.0814208496. The cubic root of 645418162 is about 864.1989362801.

The spelling of 645418162 in words is "six hundred forty-five million, four hundred eighteen thousand, one hundred sixty-two".