645772813055 has 8 divisors (see below), whose sum is σ = 774959140800. Its totient is φ = 516597073696.

The previous prime is 645772813051. The next prime is 645772813079. The reversal of 645772813055 is 550318277546.

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 645772813055 - 2² = 645772813051 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645772812988 and 645772813006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645772813051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2512295 + ... + 2757384.

It is an arithmetic number, because the mean of its divisors is an integer number (96869892600).

Almost surely, 2^645772813055 is an apocalyptic number.

645772813055 is a deficient number, since it is larger than the sum of its proper divisors (129186327745).

645772813055 is a wasteful number, since it uses less digits than its factorization.

645772813055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5294193.

The product of its (nonzero) digits is 7056000, while the sum is 53.

The spelling of 645772813055 in words is "six hundred forty-five billion, seven hundred seventy-two million, eight hundred thirteen thousand, fifty-five".