266402564164 has 81 divisors (see below), whose sum is σ = 531376127191. Its totient is φ = 116771966080.

The previous prime is 266402564159. The next prime is 266402564171. The reversal of 266402564164 is 461465204662.

It is a happy number.

The square root of 266402564164 is 516142.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 51737141764 + 214665422400 = 227458^2 + 463320^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 329298192 + ... + 329299000.

Almost surely, 2^266402564164 is an apocalyptic number.

266402564164 is the 516142-nd square number.

It is an amenable number.

266402564164 is a deficient number, since it is larger than the sum of its proper divisors (264973563027).

266402564164 is an equidigital number, since it uses as much as digits as its factorization.

266402564164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1702 (or 851 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 46.

The spelling of 266402564164 in words is "two hundred sixty-six billion, four hundred two million, five hundred sixty-four thousand, one hundred sixty-four".