72535023173 has 4 divisors (see below), whose sum is σ = 76801789260. Its totient is φ = 68268257088.

The previous prime is 72535023163. The next prime is 72535023217. The reversal of 72535023173 is 37132053527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37132053527 = 181 ⋅205149467.

It can be written as a sum of positive squares in 2 ways, for example, as 53323122724 + 19211900449 = 230918^2 + 138607^2 .

It is a cyclic number.

It is not a de Polignac number, because 72535023173 - 2¹⁰ = 72535022149 is a prime.

It is a super-2 number, since 2×72535023173² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72535023163) 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, 2133383018 + ... + 2133383051.

It is an arithmetic number, because the mean of its divisors is an integer number (19200447315).

Almost surely, 2^72535023173 is an apocalyptic number.

It is an amenable number.

72535023173 is a deficient number, since it is larger than the sum of its proper divisors (4266766087).

72535023173 is a wasteful number, since it uses less digits than its factorization.

72535023173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4266766086.

The product of its (nonzero) digits is 132300, while the sum is 38.

The spelling of 72535023173 in words is "seventy-two billion, five hundred thirty-five million, twenty-three thousand, one hundred seventy-three".