645043394334 has 32 divisors (see below), whose sum is σ = 1292487693696. Its totient is φ = 214614560160.

The previous prime is 645043394321. The next prime is 645043394339. The reversal of 645043394334 is 433493340546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645043394339) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11064249 + ... + 11122395.

It is an arithmetic number, because the mean of its divisors is an integer number (40390240428).

Almost surely, 2^645043394334 is an apocalyptic number.

645043394334 is an abundant number, since it is smaller than the sum of its proper divisors (647444299362).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645043394334 is a wasteful number, since it uses less digits than its factorization.

645043394334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61560.

The product of its (nonzero) digits is 5598720, while the sum is 48.

The spelling of 645043394334 in words is "six hundred forty-five billion, forty-three million, three hundred ninety-four thousand, three hundred thirty-four".