645295694 has 4 divisors (see below), whose sum is σ = 967943544. Its totient is φ = 322647846.

The previous prime is 645295687. The next prime is 645295697. The reversal of 645295694 is 496592546.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645295697) by changing a digit.

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 as a sum of consecutive naturals, namely, 161323922 + ... + 161323925.

It is an arithmetic number, because the mean of its divisors is an integer number (241985886).

Almost surely, 2^645295694 is an apocalyptic number.

645295694 is a deficient number, since it is larger than the sum of its proper divisors (322647850).

645295694 is a wasteful number, since it uses less digits than its factorization.

645295694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322647849.

The product of its digits is 2332800, while the sum is 50.

The square root of 645295694 is about 25402.6710012943. The cubic root of 645295694 is about 864.1442722827.

The spelling of 645295694 in words is "six hundred forty-five million, two hundred ninety-five thousand, six hundred ninety-four".