645098695 has 4 divisors (see below), whose sum is σ = 774118440. Its totient is φ = 516078952.

The previous prime is 645098689. The next prime is 645098719. The reversal of 645098695 is 596890546.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 645098695 - 2¹³ = 645090503 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64509865 + ... + 64509874.

It is an arithmetic number, because the mean of its divisors is an integer number (193529610).

Almost surely, 2^645098695 is an apocalyptic number.

645098695 is a deficient number, since it is larger than the sum of its proper divisors (129019745).

645098695 is a wasteful number, since it uses less digits than its factorization.

645098695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129019744.

The product of its (nonzero) digits is 2332800, while the sum is 52.

The square root of 645098695 is about 25398.7931799918. The cubic root of 645098695 is about 864.0563266140.

The spelling of 645098695 in words is "six hundred forty-five million, ninety-eight thousand, six hundred ninety-five".