645622831427 has 4 divisors (see below), whose sum is σ = 737854664496. Its totient is φ = 553390998360.

The previous prime is 645622831417. The next prime is 645622831429. The reversal of 645622831427 is 724138226546.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 645622831427 - 2¹⁰ = 645622830403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645622831429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46115916524 + ... + 46115916537.

It is an arithmetic number, because the mean of its divisors is an integer number (184463666124).

Almost surely, 2^645622831427 is an apocalyptic number.

645622831427 is a deficient number, since it is larger than the sum of its proper divisors (92231833069).

645622831427 is an equidigital number, since it uses as much as digits as its factorization.

645622831427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92231833068.

The product of its digits is 3870720, while the sum is 50.

The spelling of 645622831427 in words is "six hundred forty-five billion, six hundred twenty-two million, eight hundred thirty-one thousand, four hundred twenty-seven".