645747495 has 64 divisors (see below), whose sum is σ = 1119899520. Its totient is φ = 317011968.

The previous prime is 645747493. The next prime is 645747497. The reversal of 645747495 is 594747546.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (645747493) and next prime (645747497).

It is not a de Polignac number, because 645747495 - 2¹ = 645747493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645747491) 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 in 63 ways as a sum of consecutive naturals, for example, 852657 + ... + 853413.

It is an arithmetic number, because the mean of its divisors is an integer number (17498430).

Almost surely, 2^645747495 is an apocalyptic number.

645747495 is a deficient number, since it is larger than the sum of its proper divisors (474152025).

645747495 is a wasteful number, since it uses less digits than its factorization.

645747495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884.

The product of its digits is 4233600, while the sum is 51.

The square root of 645747495 is about 25411.5622306068. The cubic root of 645747495 is about 864.3459008633.

Adding to 645747495 its sum of digits (51), we get a palindrome (645747546).

The spelling of 645747495 in words is "six hundred forty-five million, seven hundred forty-seven thousand, four hundred ninety-five".