645610414553 has 16 divisors (see below), whose sum is σ = 751834379520. Its totient is φ = 548958418176.

The previous prime is 645610414549. The next prime is 645610414567. The reversal of 645610414553 is 355414016546.

It is a cyclic number.

It is not a de Polignac number, because 645610414553 - 2² = 645610414549 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645610414573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31067423 + ... + 31088196.

It is an arithmetic number, because the mean of its divisors is an integer number (46989648720).

Almost surely, 2^645610414553 is an apocalyptic number.

It is an amenable number.

645610414553 is a deficient number, since it is larger than the sum of its proper divisors (106223964967).

645610414553 is a wasteful number, since it uses less digits than its factorization.

645610414553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62155696.

The product of its (nonzero) digits is 864000, while the sum is 44.

The spelling of 645610414553 in words is "six hundred forty-five billion, six hundred ten million, four hundred fourteen thousand, five hundred fifty-three".