266691042 has 48 divisors (see below), whose sum is σ = 615468672. Its totient is φ = 86488560.

The previous prime is 266691041. The next prime is 266691083. The reversal of 266691042 is 240196662.

It is a super-2 number, since 2×266691042² = 142248223766091528, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 266690988 and 266691006.

It is not an unprimeable number, because it can be changed into a prime (266691041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10567 + ... + 25397.

It is an arithmetic number, because the mean of its divisors is an integer number (12822264).

Almost surely, 2^266691042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266691042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (307734336).

266691042 is an abundant number, since it is smaller than the sum of its proper divisors (348777630).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

266691042 is a wasteful number, since it uses less digits than its factorization.

266691042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14885 (or 14873 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 266691042 is about 16330.6779406123. The cubic root of 266691042 is about 643.6792009109.

The spelling of 266691042 in words is "two hundred sixty-six million, six hundred ninety-one thousand, forty-two".