266620240154161 has 4 divisors (see below), whose sum is σ = 266693669031424. Its totient is φ = 266546811276900.

The previous prime is 266620240154153. The next prime is 266620240154227. The reversal of 266620240154161 is 161451042026662.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 266620240154161 - 2³ = 266620240154153 is a prime.

It is a super-2 number, since 2×266620240154161² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266620240154461) 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, 36714433185 + ... + 36714440446.

It is an arithmetic number, because the mean of its divisors is an integer number (66673417257856).

Almost surely, 2^{266620240154161} is an apocalyptic number.

It is an amenable number.

266620240154161 is a deficient number, since it is larger than the sum of its proper divisors (73428877263).

266620240154161 is an equidigital number, since it uses as much as digits as its factorization.

266620240154161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73428877262.

The product of its (nonzero) digits is 829440, while the sum is 46.

The spelling of 266620240154161 in words is "two hundred sixty-six trillion, six hundred twenty billion, two hundred forty million, one hundred fifty-four thousand, one hundred sixty-one".