72872156866 has 8 divisors (see below), whose sum is σ = 109331403084. Its totient is φ = 36428355840.

The previous prime is 72872156843. The next prime is 72872156867. The reversal of 72872156866 is 66865127827.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 71705592841 + 1166564025 = 267779^2 + 34155^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 72872156866.

It is not an unprimeable number, because it can be changed into a prime (72872156867) 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 3 ways as a sum of consecutive naturals, for example, 3849495 + ... + 3868378.

Almost surely, 2^72872156866 is an apocalyptic number.

72872156866 is a deficient number, since it is larger than the sum of its proper divisors (36459246218).

72872156866 is a wasteful number, since it uses less digits than its factorization.

72872156866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7722596.

The product of its digits is 13547520, while the sum is 58.

It can be divided in two parts, 728721 and 56866, that added together give a palindrome (785587).

The spelling of 72872156866 in words is "seventy-two billion, eight hundred seventy-two million, one hundred fifty-six thousand, eight hundred sixty-six".