65427166690909 has 4 divisors (see below), whose sum is σ = 67195468493404. Its totient is φ = 63658864888416.

The previous prime is 65427166690903. The next prime is 65427166690939. The reversal of 65427166690909 is 90909666172456.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23124461264100 + 42302705426809 = 4808790^2 + 6504053^2 .

It is a cyclic number.

It is not a de Polignac number, because 65427166690909 - 2¹¹ = 65427166688861 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 (65427166690903) 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, 884150901192 + ... + 884150901265.

It is an arithmetic number, because the mean of its divisors is an integer number (16798867123351).

Almost surely, 2^{65427166690909} is an apocalyptic number.

It is an amenable number.

65427166690909 is a deficient number, since it is larger than the sum of its proper divisors (1768301802495).

65427166690909 is a wasteful number, since it uses less digits than its factorization.

65427166690909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1768301802494.

The product of its (nonzero) digits is 264539520, while the sum is 70.

The spelling of 65427166690909 in words is "sixty-five trillion, four hundred twenty-seven billion, one hundred sixty-six million, six hundred ninety thousand, nine hundred nine".