72565415781 has 8 divisors (see below), whose sum is σ = 96793534464. Its totient is φ = 48357120480.

The previous prime is 72565415779. The next prime is 72565415803. The reversal of 72565415781 is 18751456527.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72565415781 - 2¹ = 72565415779 is a prime.

It is a super-2 number, since 2×72565415781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72565414781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4947301 + ... + 4961946.

It is an arithmetic number, because the mean of its divisors is an integer number (12099191808).

Almost surely, 2^72565415781 is an apocalyptic number.

It is an amenable number.

72565415781 is a deficient number, since it is larger than the sum of its proper divisors (24228118683).

72565415781 is a wasteful number, since it uses less digits than its factorization.

72565415781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9911691.

The product of its digits is 2352000, while the sum is 51.

The spelling of 72565415781 in words is "seventy-two billion, five hundred sixty-five million, four hundred fifteen thousand, seven hundred eighty-one".