665127865243 has 2 divisors, whose sum is σ = 665127865244. Its totient is φ = 665127865242.

The previous prime is 665127865189. The next prime is 665127865261. The reversal of 665127865243 is 342568721566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665127865243 - 2¹⁷ = 665127734171 is a prime.

It is a super-4 number, since 4×665127865243⁴ (a number of 48 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (665827865243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332563932621 + 332563932622.

It is an arithmetic number, because the mean of its divisors is an integer number (332563932622).

Almost surely, 2^665127865243 is an apocalyptic number.

665127865243 is a deficient number, since it is larger than the sum of its proper divisors (1).

665127865243 is an equidigital number, since it uses as much as digits as its factorization.

665127865243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14515200, while the sum is 55.

The spelling of 665127865243 in words is "six hundred sixty-five billion, one hundred twenty-seven million, eight hundred sixty-five thousand, two hundred forty-three".