26661044636 has 12 divisors (see below), whose sum is σ = 46696953912. Its totient is φ = 13319057808.

The previous prime is 26661044629. The next prime is 26661044653. The reversal of 26661044636 is 63644016662.

It is a happy number.

It is a super-2 number, since 2×26661044636² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2860895 + ... + 2870198.

It is an arithmetic number, because the mean of its divisors is an integer number (3891412826).

Almost surely, 2^26661044636 is an apocalyptic number.

It is an amenable number.

26661044636 is a deficient number, since it is larger than the sum of its proper divisors (20035909276).

26661044636 is a wasteful number, since it uses less digits than its factorization.

26661044636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5732260 (or 5732258 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 44.

The spelling of 26661044636 in words is "twenty-six billion, six hundred sixty-one million, forty-four thousand, six hundred thirty-six".