645422227057 has 16 divisors (see below), whose sum is σ = 688668894720. Its totient is φ = 603525079872.

The previous prime is 645422227033. The next prime is 645422227061. The reversal of 645422227057 is 750722224546.

It is not a de Polignac number, because 645422227057 - 2¹⁹ = 645421702769 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645422226998 and 645422227016.

It is not an unprimeable number, because it can be changed into a prime (645422227097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 618057 + ... + 1293382.

It is an arithmetic number, because the mean of its divisors is an integer number (43041805920).

Almost surely, 2^645422227057 is an apocalyptic number.

It is an amenable number.

645422227057 is a deficient number, since it is larger than the sum of its proper divisors (43246667663).

645422227057 is a wasteful number, since it uses less digits than its factorization.

645422227057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1911792.

The product of its (nonzero) digits is 1881600, while the sum is 46.

The spelling of 645422227057 in words is "six hundred forty-five billion, four hundred twenty-two million, two hundred twenty-seven thousand, fifty-seven".