665465354060121 has 12 divisors (see below), whose sum is σ = 987206861579172. Its totient is φ = 431653202633376.

The previous prime is 665465354060033. The next prime is 665465354060137. The reversal of 665465354060121 is 121060453564566.

665465354060121 is a `hidden beast` number, since 6 + 6 + 5 + 4 + 6 + 5 + 3 + 5 + 4 + 0 + 601 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 632270471810121 + 33194882250000 = 25144989^2 + 5761500^2 .

It is not a de Polignac number, because 665465354060121 - 2²² = 665465349865817 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (665465354060161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 999197227986 + ... + 999197228651.

It is an arithmetic number, because the mean of its divisors is an integer number (82267238464931).

Almost surely, 2^{665465354060121} is an apocalyptic number.

It is an amenable number.

665465354060121 is a deficient number, since it is larger than the sum of its proper divisors (321741507519051).

665465354060121 is a wasteful number, since it uses less digits than its factorization.

665465354060121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1998394456680 (or 1998394456677 counting only the distinct ones).

The product of its (nonzero) digits is 15552000, while the sum is 54.

The spelling of 665465354060121 in words is "six hundred sixty-five trillion, four hundred sixty-five billion, three hundred fifty-four million, sixty thousand, one hundred twenty-one".