123221947664 has 20 divisors (see below), whose sum is σ = 238752993756. Its totient is φ = 61608271872.

The previous prime is 123221947663. The next prime is 123221947679. The reversal of 123221947664 is 466749122321.

It can be written as a sum of positive squares in 2 ways, for example, as 4398342400 + 118823605264 = 66320^2 + 344708^2 .

It is a super-2 number, since 2×123221947664² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (123221947663) 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, 236912 + ... + 550064.

Almost surely, 2^123221947664 is an apocalyptic number.

It is an amenable number.

123221947664 is a deficient number, since it is larger than the sum of its proper divisors (115531046092).

123221947664 is a wasteful number, since it uses less digits than its factorization.

123221947664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337754 (or 337748 counting only the distinct ones).

The product of its digits is 870912, while the sum is 47.

The spelling of 123221947664 in words is "one hundred twenty-three billion, two hundred twenty-one million, nine hundred forty-seven thousand, six hundred sixty-four".