645336999 has 12 divisors (see below), whose sum is σ = 934592256. Its totient is φ = 429099072.

The previous prime is 645336977. The next prime is 645337003. The reversal of 645336999 is 999633546.

It is a de Polignac number, because none of the positive numbers 2^k-645336999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645336799) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90162 + ... + 97055.

It is an arithmetic number, because the mean of its divisors is an integer number (77882688).

Almost surely, 2^645336999 is an apocalyptic number.

645336999 is a deficient number, since it is larger than the sum of its proper divisors (289255257).

645336999 is a wasteful number, since it uses less digits than its factorization.

645336999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187606 (or 187603 counting only the distinct ones).

The product of its digits is 4723920, while the sum is 54.

The square root of 645336999 is about 25403.4839933423. The cubic root of 645336999 is about 864.1627096792.

The spelling of 645336999 in words is "six hundred forty-five million, three hundred thirty-six thousand, nine hundred ninety-nine".