645606275 has 6 divisors (see below), whose sum is σ = 800551812. Its totient is φ = 516485000.

The previous prime is 645606253. The next prime is 645606307. The reversal of 645606275 is 572606546.

It is not a de Polignac number, because 645606275 - 2¹⁰ = 645605251 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12912101 + ... + 12912150.

It is an arithmetic number, because the mean of its divisors is an integer number (133425302).

Almost surely, 2^645606275 is an apocalyptic number.

645606275 is a deficient number, since it is larger than the sum of its proper divisors (154945537).

645606275 is a wasteful number, since it uses less digits than its factorization.

645606275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25824261 (or 25824256 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 41.

The square root of 645606275 is about 25408.7834222735. The cubic root of 645606275 is about 864.2828876741.

The spelling of 645606275 in words is "six hundred forty-five million, six hundred six thousand, two hundred seventy-five".