172343427785 has 8 divisors (see below), whose sum is σ = 208709472840. Its totient is φ = 136609835904.

The previous prime is 172343427779. The next prime is 172343427811. The reversal of 172343427785 is 587724343271.

It can be written as a sum of positive squares in 4 ways, for example, as 1242069049 + 171101358736 = 35243^2 + 413644^2 .

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 172343427785 - 2¹² = 172343423689 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158112692 + ... + 158113781.

It is an arithmetic number, because the mean of its divisors is an integer number (26088684105).

Almost surely, 2^172343427785 is an apocalyptic number.

It is an amenable number.

172343427785 is a deficient number, since it is larger than the sum of its proper divisors (36366045055).

172343427785 is a wasteful number, since it uses less digits than its factorization.

172343427785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316226587.

The product of its digits is 7902720, while the sum is 53.

The spelling of 172343427785 in words is "one hundred seventy-two billion, three hundred forty-three million, four hundred twenty-seven thousand, seven hundred eighty-five".