217131272435065 has 8 divisors (see below), whose sum is σ = 263137304416968. Its totient is φ = 171985166284800.

The previous prime is 217131272435059. The next prime is 217131272435089. The reversal of 217131272435065 is 560534272131712.

It can be written as a sum of positive squares in 4 ways, for example, as 15772589846784 + 201358682588281 = 3971472^2 + 14190091^2 .

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

It is not a de Polignac number, because 217131272435065 - 2³ = 217131272435057 is a prime.

It is a Duffinian 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, 214981457352 + ... + 214981458361.

It is an arithmetic number, because the mean of its divisors is an integer number (32892163052121).

Almost surely, 2^{217131272435065} is an apocalyptic number.

It is an amenable number.

217131272435065 is a deficient number, since it is larger than the sum of its proper divisors (46006031981903).

217131272435065 is a wasteful number, since it uses less digits than its factorization.

217131272435065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429962915819.

The product of its (nonzero) digits is 2116800, while the sum is 49.

The spelling of 217131272435065 in words is "two hundred seventeen trillion, one hundred thirty-one billion, two hundred seventy-two million, four hundred thirty-five thousand, sixty-five".