645123347 has 4 divisors (see below), whose sum is σ = 703770936. Its totient is φ = 586475760.

The previous prime is 645123341. The next prime is 645123403. The reversal of 645123347 is 743321546.

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 645123347 - 2⁸ = 645123091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645123341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29323778 + ... + 29323799.

It is an arithmetic number, because the mean of its divisors is an integer number (175942734).

Almost surely, 2^645123347 is an apocalyptic number.

645123347 is a deficient number, since it is larger than the sum of its proper divisors (58647589).

645123347 is a wasteful number, since it uses less digits than its factorization.

645123347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58647588.

The product of its digits is 60480, while the sum is 35.

The square root of 645123347 is about 25399.2784740039. The cubic root of 645123347 is about 864.0673329119.

The spelling of 645123347 in words is "six hundred forty-five million, one hundred twenty-three thousand, three hundred forty-seven".