645717459 has 8 divisors (see below), whose sum is σ = 861122560. Its totient is φ = 430395336.

The previous prime is 645717437. The next prime is 645717461. The reversal of 645717459 is 954717546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 645717459 - 2⁵ = 645717427 is a prime.

It is a super-3 number, since 3×645717459³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645717419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 534 + ... + 35940.

It is an arithmetic number, because the mean of its divisors is an integer number (107640320).

Almost surely, 2^645717459 is an apocalyptic number.

645717459 is a deficient number, since it is larger than the sum of its proper divisors (215405101).

645717459 is a wasteful number, since it uses less digits than its factorization.

645717459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41489.

The product of its digits is 1058400, while the sum is 48.

The square root of 645717459 is about 25410.9712329143. The cubic root of 645717459 is about 864.3324993938.

The spelling of 645717459 in words is "six hundred forty-five million, seven hundred seventeen thousand, four hundred fifty-nine".