26040640220066 has 8 divisors (see below), whose sum is σ = 39062631886380. Its totient is φ = 13019762924608.

The previous prime is 26040640220051. The next prime is 26040640220087. The reversal of 26040640220066 is 66002204604062.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 26037496263025 + 3143957041 = 5102695^2 + 56071^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×26040640220066² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278534291 + ... + 278627766.

Almost surely, 2^{26040640220066} is an apocalyptic number.

26040640220066 is a deficient number, since it is larger than the sum of its proper divisors (13021991666314).

26040640220066 is a wasteful number, since it uses less digits than its factorization.

26040640220066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557185428.

The product of its (nonzero) digits is 165888, while the sum is 38.

The spelling of 26040640220066 in words is "twenty-six trillion, forty billion, six hundred forty million, two hundred twenty thousand, sixty-six".