72164524240531 has 4 divisors (see below), whose sum is σ = 73699939649952. Its totient is φ = 70629108831112.

The previous prime is 72164524240519. The next prime is 72164524240621. The reversal of 72164524240531 is 13504242546127.

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 72164524240531 - 2¹⁷ = 72164524109459 is a prime.

It is a super-2 number, since 2×72164524240531² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72164524240631) 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, 767707704640 + ... + 767707704733.

It is an arithmetic number, because the mean of its divisors is an integer number (18424984912488).

Almost surely, 2^{72164524240531} is an apocalyptic number.

72164524240531 is a deficient number, since it is larger than the sum of its proper divisors (1535415409421).

72164524240531 is a wasteful number, since it uses less digits than its factorization.

72164524240531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1535415409420.

The product of its (nonzero) digits is 1612800, while the sum is 46.

Adding to 72164524240531 its reverse (13504242546127), we get a palindrome (85668766786658).

The spelling of 72164524240531 in words is "seventy-two trillion, one hundred sixty-four billion, five hundred twenty-four million, two hundred forty thousand, five hundred thirty-one".