72158522594 has 4 divisors (see below), whose sum is σ = 108237783894. Its totient is φ = 36079261296.

The previous prime is 72158522591. The next prime is 72158522621. The reversal of 72158522594 is 49522585127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49522585127 = 49783 ⋅994769.

It can be written as a sum of positive squares in only one way, i.e., 46865755225 + 25292767369 = 216485^2 + 159037^2 .

It is not an unprimeable number, because it can be changed into a prime (72158522591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18039630647 + ... + 18039630650.

Almost surely, 2^72158522594 is an apocalyptic number.

72158522594 is a deficient number, since it is larger than the sum of its proper divisors (36079261300).

72158522594 is a wasteful number, since it uses less digits than its factorization.

72158522594 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36079261299.

The product of its digits is 2016000, while the sum is 50.

The spelling of 72158522594 in words is "seventy-two billion, one hundred fifty-eight million, five hundred twenty-two thousand, five hundred ninety-four".