72166774565 has 8 divisors (see below), whose sum is σ = 86620488480. Its totient is φ = 57719846992.

The previous prime is 72166774549. The next prime is 72166774597. The reversal of 72166774565 is 56547766127.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 72166774565 - 2⁴ = 72166774549 is a prime.

It is a super-2 number, since 2×72166774565² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 72166774565.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1673159 + ... + 1715748.

It is an arithmetic number, because the mean of its divisors is an integer number (10827561060).

Almost surely, 2^72166774565 is an apocalyptic number.

It is an amenable number.

72166774565 is a deficient number, since it is larger than the sum of its proper divisors (14453713915).

72166774565 is a wasteful number, since it uses less digits than its factorization.

72166774565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3393171.

The product of its digits is 14817600, while the sum is 56.

The spelling of 72166774565 in words is "seventy-two billion, one hundred sixty-six million, seven hundred seventy-four thousand, five hundred sixty-five".