645351266 has 24 divisors (see below), whose sum is σ = 1150039296. Its totient is φ = 270692520.

The previous prime is 645351257. The next prime is 645351281. The reversal of 645351266 is 662153546.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65450 + ... + 74661.

It is an arithmetic number, because the mean of its divisors is an integer number (47918304).

Almost surely, 2^645351266 is an apocalyptic number.

645351266 is a deficient number, since it is larger than the sum of its proper divisors (504688030).

645351266 is a wasteful number, since it uses less digits than its factorization.

645351266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140174 (or 140167 counting only the distinct ones).

The product of its digits is 129600, while the sum is 38.

The square root of 645351266 is about 25403.7647997300. The cubic root of 645351266 is about 864.1690778860.

The spelling of 645351266 in words is "six hundred forty-five million, three hundred fifty-one thousand, two hundred sixty-six".