65172431617 has 2 divisors, whose sum is σ = 65172431618. Its totient is φ = 65172431616.

The previous prime is 65172431591. The next prime is 65172431629. The reversal of 65172431617 is 71613427156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53735412481 + 11437019136 = 231809^2 + 106944^2 .

It is a cyclic number.

It is not a de Polignac number, because 65172431617 - 2³¹ = 63024947969 is a prime.

It is not a weakly prime, because it can be changed into another prime (65172435617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32586215808 + 32586215809.

It is an arithmetic number, because the mean of its divisors is an integer number (32586215809).

Almost surely, 2^65172431617 is an apocalyptic number.

It is an amenable number.

65172431617 is a deficient number, since it is larger than the sum of its proper divisors (1).

65172431617 is an equidigital number, since it uses as much as digits as its factorization.

65172431617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 43.

The spelling of 65172431617 in words is "sixty-five billion, one hundred seventy-two million, four hundred thirty-one thousand, six hundred seventeen".