665012336506251 has 16 divisors (see below), whose sum is σ = 895572610493184. Its totient is φ = 438899511261024.

The previous prime is 665012336506159. The next prime is 665012336506261. The reversal of 665012336506251 is 152605633210566.

It is not a de Polignac number, because 665012336506251 - 2¹⁰ = 665012336505227 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 665012336506194 and 665012336506203.

It is not an unprimeable number, because it can be changed into a prime (665012336506261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 336659316 + ... + 338628881.

It is an arithmetic number, because the mean of its divisors is an integer number (55973288155824).

Almost surely, 2^{665012336506251} is an apocalyptic number.

665012336506251 is a deficient number, since it is larger than the sum of its proper divisors (230560273986933).

665012336506251 is a wasteful number, since it uses less digits than its factorization.

665012336506251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675291490.

The product of its (nonzero) digits is 5832000, while the sum is 51.

The spelling of 665012336506251 in words is "six hundred sixty-five trillion, twelve billion, three hundred thirty-six million, five hundred six thousand, two hundred fifty-one".