172727363509 has 4 divisors (see below), whose sum is σ = 172728198016. Its totient is φ = 172726529004.

The previous prime is 172727363461. The next prime is 172727363537. The reversal of 172727363509 is 905363727271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 905363727271 = 19427 ⋅46603373.

It is a cyclic number.

It is not a de Polignac number, because 172727363509 - 2¹⁷ = 172727232437 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 (172727363309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153052 + ... + 607354.

It is an arithmetic number, because the mean of its divisors is an integer number (43182049504).

Almost surely, 2^172727363509 is an apocalyptic number.

It is an amenable number.

172727363509 is a deficient number, since it is larger than the sum of its proper divisors (834507).

172727363509 is an equidigital number, since it uses as much as digits as its factorization.

172727363509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834506.

The product of its (nonzero) digits is 3333960, while the sum is 52.

The spelling of 172727363509 in words is "one hundred seventy-two billion, seven hundred twenty-seven million, three hundred sixty-three thousand, five hundred nine".