645534323455 has 8 divisors (see below), whose sum is σ = 885304215072. Its totient is φ = 442652107488.

The previous prime is 645534323407. The next prime is 645534323501. The reversal of 645534323455 is 554323435546.

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 645534323455 - 2⁹ = 645534322943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645534323399 and 645534323408.

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, 9221918872 + ... + 9221918941.

It is an arithmetic number, because the mean of its divisors is an integer number (110663026884).

Almost surely, 2^645534323455 is an apocalyptic number.

645534323455 is a deficient number, since it is larger than the sum of its proper divisors (239769891617).

645534323455 is a wasteful number, since it uses less digits than its factorization.

645534323455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18443837825.

The product of its digits is 12960000, while the sum is 49.

The spelling of 645534323455 in words is "six hundred forty-five billion, five hundred thirty-four million, three hundred twenty-three thousand, four hundred fifty-five".