645677065 has 16 divisors (see below), whose sum is σ = 845816256. Its totient is φ = 469268800.

The previous prime is 645677041. The next prime is 645677089. The reversal of 645677065 is 560776546.

It is an interprime number because it is at equal distance from previous prime (645677041) and next prime (645677089).

It is not a de Polignac number, because 645677065 - 2¹⁹ = 645152777 is a prime.

It is a super-3 number, since 3×645677065³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107235 + ... + 113095.

It is an arithmetic number, because the mean of its divisors is an integer number (52863516).

Almost surely, 2^645677065 is an apocalyptic number.

It is an amenable number.

645677065 is a deficient number, since it is larger than the sum of its proper divisors (200139191).

645677065 is a wasteful number, since it uses less digits than its factorization.

645677065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7880.

The product of its (nonzero) digits is 1058400, while the sum is 46.

The square root of 645677065 is about 25410.1764063141. The cubic root of 645677065 is about 864.3144757342.

It can be divided in two parts, 6456 and 77065, that added together give a 4-th power (83521 = 17⁴).

The spelling of 645677065 in words is "six hundred forty-five million, six hundred seventy-seven thousand, sixty-five".