646225522647 has 32 divisors (see below), whose sum is σ = 925280064000. Its totient is φ = 399958611840.

The previous prime is 646225522643. The next prime is 646225522669. The reversal of 646225522647 is 746225522646.

It is not a de Polignac number, because 646225522647 - 2² = 646225522643 is a prime.

It is a super-2 number, since 2×646225522647² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 646225522647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646225522643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 589854 + ... + 1280772.

It is an arithmetic number, because the mean of its divisors is an integer number (28915002000).

Almost surely, 2^646225522647 is an apocalyptic number.

646225522647 is a deficient number, since it is larger than the sum of its proper divisors (279054541353).

646225522647 is a wasteful number, since it uses less digits than its factorization.

646225522647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691271.

The product of its digits is 9676800, while the sum is 51.

Subtracting 646225522647 from its reverse (746225522646), we obtain a palindrome (99999999999).

The spelling of 646225522647 in words is "six hundred forty-six billion, two hundred twenty-five million, five hundred twenty-two thousand, six hundred forty-seven".