72177242717 has 4 divisors (see below), whose sum is σ = 72190513596. Its totient is φ = 72163971840.

The previous prime is 72177242677. The next prime is 72177242729. The reversal of 72177242717 is 71724277127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71724277127 = 59723 ⋅1200949.

It can be written as a sum of positive squares in 2 ways, for example, as 56818349956 + 15358892761 = 238366^2 + 123931^2 .

It is a cyclic number.

It is not a de Polignac number, because 72177242717 - 2¹² = 72177238621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72177212717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6627278 + ... + 6638159.

It is an arithmetic number, because the mean of its divisors is an integer number (18047628399).

Almost surely, 2^72177242717 is an apocalyptic number.

It is an amenable number.

72177242717 is a deficient number, since it is larger than the sum of its proper divisors (13270879).

72177242717 is a wasteful number, since it uses less digits than its factorization.

72177242717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13270878.

The product of its digits is 537824, while the sum is 47.

The spelling of 72177242717 in words is "seventy-two billion, one hundred seventy-seven million, two hundred forty-two thousand, seven hundred seventeen".