26040641666 has 32 divisors (see below), whose sum is σ = 42198767856. Its totient is φ = 11980800000.

The previous prime is 26040641663. The next prime is 26040641747. The reversal of 26040641666 is 66614604062.

It can be written as a sum of positive squares in 8 ways, for example, as 161163025 + 25879478641 = 12695^2 + 160871^2 .

It is not an unprimeable number, because it can be changed into a prime (26040641663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20015216 + ... + 20016516.

Almost surely, 2^26040641666 is an apocalyptic number.

26040641666 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

26040641666 is a deficient number, since it is larger than the sum of its proper divisors (16158126190).

26040641666 is a wasteful number, since it uses less digits than its factorization.

26040641666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3158.

The product of its (nonzero) digits is 248832, while the sum is 41.

The spelling of 26040641666 in words is "twenty-six billion, forty million, six hundred forty-one thousand, six hundred sixty-six".