21667526606 has 16 divisors (see below), whose sum is σ = 35540588160. Its totient is φ = 9825365880.

The previous prime is 21667526597. The next prime is 21667526627. The reversal of 21667526606 is 60662576612.

It is a happy number.

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, 1166066 + ... + 1184501.

It is an arithmetic number, because the mean of its divisors is an integer number (2221286760).

Almost surely, 2^21667526606 is an apocalyptic number.

21667526606 is a deficient number, since it is larger than the sum of its proper divisors (13873061554).

21667526606 is a wasteful number, since it uses less digits than its factorization.

21667526606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2350999.

The product of its (nonzero) digits is 1088640, while the sum is 47.

The spelling of 21667526606 in words is "twenty-one billion, six hundred sixty-seven million, five hundred twenty-six thousand, six hundred six".