645755735 has 16 divisors (see below), whose sum is σ = 780848640. Its totient is φ = 512660640.

The previous prime is 645755729. The next prime is 645755741. The reversal of 645755735 is 537557546.

It is an interprime number because it is at equal distance from previous prime (645755729) and next prime (645755741).

It is a de Polignac number, because none of the positive numbers 2^k-645755735 is a prime.

It is a super-3 number, since 3×645755735³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 645755735.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 408176 + ... + 409754.

It is an arithmetic number, because the mean of its divisors is an integer number (48803040).

Almost surely, 2^645755735 is an apocalyptic number.

645755735 is a deficient number, since it is larger than the sum of its proper divisors (135092905).

645755735 is a wasteful number, since it uses less digits than its factorization.

645755735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2158.

The product of its digits is 2205000, while the sum is 47.

The square root of 645755735 is about 25411.7243610110. The cubic root of 645755735 is about 864.3495773158.

The spelling of 645755735 in words is "six hundred forty-five million, seven hundred fifty-five thousand, seven hundred thirty-five".