645434500677 has 8 divisors (see below), whose sum is σ = 860586362016. Its totient is φ = 430286153232.

The previous prime is 645434500631. The next prime is 645434500699. The reversal of 645434500677 is 776005434546.

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

It is a de Polignac number, because none of the positive numbers 2^k-645434500677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645434504677) 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, 414943 + ... + 1209564.

It is an arithmetic number, because the mean of its divisors is an integer number (107573295252).

Almost surely, 2^645434500677 is an apocalyptic number.

It is an amenable number.

645434500677 is a deficient number, since it is larger than the sum of its proper divisors (215151861339).

645434500677 is a wasteful number, since it uses less digits than its factorization.

645434500677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1756947.

The product of its (nonzero) digits is 8467200, while the sum is 51.

The spelling of 645434500677 in words is "six hundred forty-five billion, four hundred thirty-four million, five hundred thousand, six hundred seventy-seven".