645164677 has 8 divisors (see below), whose sum is σ = 650124440. Its totient is φ = 640224000.

The previous prime is 645164659. The next prime is 645164693. The reversal of 645164677 is 776461546.

645164677 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 10074276 + 635090401 = 3174^2 + 25201^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 645164677 - 2¹¹ = 645162629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645168677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67177 + ... + 76177.

It is an arithmetic number, because the mean of its divisors is an integer number (81265555).

Almost surely, 2^645164677 is an apocalyptic number.

It is an amenable number.

645164677 is a deficient number, since it is larger than the sum of its proper divisors (4959763).

645164677 is a wasteful number, since it uses less digits than its factorization.

645164677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9543.

The product of its digits is 846720, while the sum is 46.

The square root of 645164677 is about 25400.0920667623. The cubic root of 645164677 is about 864.0857847529.

The spelling of 645164677 in words is "six hundred forty-five million, one hundred sixty-four thousand, six hundred seventy-seven".