645621255055 has 8 divisors (see below), whose sum is σ = 885423435552. Its totient is φ = 442711717728.

The previous prime is 645621255043. The next prime is 645621255091. The reversal of 645621255055 is 550552126546.

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

It is not a de Polignac number, because 645621255055 - 2¹¹ = 645621253007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645621254996 and 645621255014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9223160752 + ... + 9223160821.

It is an arithmetic number, because the mean of its divisors is an integer number (110677929444).

Almost surely, 2^645621255055 is an apocalyptic number.

645621255055 is a deficient number, since it is larger than the sum of its proper divisors (239802180497).

645621255055 is a wasteful number, since it uses less digits than its factorization.

645621255055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18446321585.

The product of its (nonzero) digits is 1800000, while the sum is 46.

The spelling of 645621255055 in words is "six hundred forty-five billion, six hundred twenty-one million, two hundred fifty-five thousand, fifty-five".