266616442 has 4 divisors (see below), whose sum is σ = 399924666. Its totient is φ = 133308220.

The previous prime is 266616359. The next prime is 266616443. The reversal of 266616442 is 244616662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 244616662 = 2 ⋅122308331.

It can be written as a sum of positive squares in only one way, i.e., 176916601 + 89699841 = 13301^2 + 9471^2 .

It is not an unprimeable number, because it can be changed into a prime (266616443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66654109 + ... + 66654112.

Almost surely, 2^266616442 is an apocalyptic number.

266616442 is a deficient number, since it is larger than the sum of its proper divisors (133308224).

266616442 is a wasteful number, since it uses less digits than its factorization.

266616442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133308223.

The product of its digits is 82944, while the sum is 37.

The square root of 266616442 is about 16328.3937360660. The cubic root of 266616442 is about 643.6191777145.

The spelling of 266616442 in words is "two hundred sixty-six million, six hundred sixteen thousand, four hundred forty-two".