72193866669 has 12 divisors (see below), whose sum is σ = 104298395292. Its totient is φ = 48120768000.

The previous prime is 72193866653. The next prime is 72193866739. The reversal of 72193866669 is 96666839127.

It can be written as a sum of positive squares in 2 ways, for example, as 65799945225 + 6393921444 = 256515^2 + 79962^2 .

It is not a de Polignac number, because 72193866669 - 2⁴ = 72193866653 is a prime.

It is a super-2 number, since 2×72193866669² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72193866769) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 652212 + ... + 754829.

It is an arithmetic number, because the mean of its divisors is an integer number (8691532941).

Almost surely, 2^72193866669 is an apocalyptic number.

It is an amenable number.

72193866669 is a deficient number, since it is larger than the sum of its proper divisors (32104528623).

72193866669 is a wasteful number, since it uses less digits than its factorization.

72193866669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1412748 (or 1412745 counting only the distinct ones).

The product of its digits is 35271936, while the sum is 63.

The spelling of 72193866669 in words is "seventy-two billion, one hundred ninety-three million, eight hundred sixty-six thousand, six hundred sixty-nine".