72055081586 has 4 divisors (see below), whose sum is σ = 108082622382. Its totient is φ = 36027540792.

The previous prime is 72055081577. The next prime is 72055081589. The reversal of 72055081586 is 68518055027.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 37434897361 + 34620184225 = 193481^2 + 186065^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 72055081586.

It is not an unprimeable number, because it can be changed into a prime (72055081589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18013770395 + ... + 18013770398.

Almost surely, 2^72055081586 is an apocalyptic number.

72055081586 is a deficient number, since it is larger than the sum of its proper divisors (36027540796).

72055081586 is a wasteful number, since it uses less digits than its factorization.

72055081586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36027540795.

The product of its (nonzero) digits is 672000, while the sum is 47.

The spelling of 72055081586 in words is "seventy-two billion, fifty-five million, eighty-one thousand, five hundred eighty-six".