266009998 has 16 divisors (see below), whose sum is σ = 402602400. Its totient is φ = 131813536.

The previous prime is 266009971. The next prime is 266010001. The reversal of 266009998 is 899900662.

It is a happy number.

It is a super-2 number, since 2×266009998² = 141522638071920008, 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, 193911 + ... + 195277.

It is an arithmetic number, because the mean of its divisors is an integer number (25162650).

Almost surely, 2^266009998 is an apocalyptic number.

266009998 is a deficient number, since it is larger than the sum of its proper divisors (136592402).

266009998 is a wasteful number, since it uses less digits than its factorization.

266009998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2171.

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 266009998 is about 16309.8129357758. The cubic root of 266009998 is about 643.1308166076.

The spelling of 266009998 in words is "two hundred sixty-six million, nine thousand, nine hundred ninety-eight".