72101323123 has 4 divisors (see below), whose sum is σ = 74427172288. Its totient is φ = 69775473960.

The previous prime is 72101323121. The next prime is 72101323127. The reversal of 72101323123 is 32132310127.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72101323123 - 2¹ = 72101323121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72101323121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1162924536 + ... + 1162924597.

It is an arithmetic number, because the mean of its divisors is an integer number (18606793072).

Almost surely, 2^72101323123 is an apocalyptic number.

72101323123 is a deficient number, since it is larger than the sum of its proper divisors (2325849165).

72101323123 is a wasteful number, since it uses less digits than its factorization.

72101323123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2325849164.

The product of its (nonzero) digits is 1512, while the sum is 25.

The spelling of 72101323123 in words is "seventy-two billion, one hundred one million, three hundred twenty-three thousand, one hundred twenty-three".