645622704553 has 8 divisors (see below), whose sum is σ = 661839048360. Its totient is φ = 629428715520.

The previous prime is 645622704527. The next prime is 645622704563. The reversal of 645622704553 is 355407226546.

It can be written as a sum of positive squares in 4 ways, for example, as 119603230569 + 526019473984 = 345837^2 + 725272^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645622704553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645622704497 and 645622704506.

It is not an unprimeable number, because it can be changed into a prime (645622704563) 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, 5530200 + ... + 5645737.

It is an arithmetic number, because the mean of its divisors is an integer number (82729881045).

Almost surely, 2^645622704553 is an apocalyptic number.

It is an amenable number.

645622704553 is a deficient number, since it is larger than the sum of its proper divisors (16216343807).

645622704553 is a wasteful number, since it uses less digits than its factorization.

645622704553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11177387.

The product of its (nonzero) digits is 6048000, while the sum is 49.

The spelling of 645622704553 in words is "six hundred forty-five billion, six hundred twenty-two million, seven hundred four thousand, five hundred fifty-three".