266661406 has 16 divisors (see below), whose sum is σ = 437172480. Its totient is φ = 120982680.

The previous prime is 266661397. The next prime is 266661431. The reversal of 266661406 is 604166662.

It is a super-2 number, since 2×266661406² = 142216610899793672, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 955 + ... + 23113.

It is an arithmetic number, because the mean of its divisors is an integer number (27323280).

Almost surely, 2^266661406 is an apocalyptic number.

266661406 is a deficient number, since it is larger than the sum of its proper divisors (170511074).

266661406 is a wasteful number, since it uses less digits than its factorization.

266661406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22719.

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 266661406 is about 16329.7705433971. The cubic root of 266661406 is about 643.6553571111.

The spelling of 266661406 in words is "two hundred sixty-six million, six hundred sixty-one thousand, four hundred six".