26706553440661 has 4 divisors (see below), whose sum is σ = 26706972700300. Its totient is φ = 26706134181024.

The previous prime is 26706553440653. The next prime is 26706553440701. The reversal of 26706553440661 is 16604435560762.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 982576562500 + 25723976878161 = 991250^2 + 5071881^2 .

It is a cyclic number.

It is not a de Polignac number, because 26706553440661 - 2³ = 26706553440653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26706553470661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209534256 + ... + 209661673.

It is an arithmetic number, because the mean of its divisors is an integer number (6676743175075).

Almost surely, 2^{26706553440661} is an apocalyptic number.

It is an amenable number.

26706553440661 is a deficient number, since it is larger than the sum of its proper divisors (419259639).

26706553440661 is an equidigital number, since it uses as much as digits as its factorization.

26706553440661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419259638.

The product of its (nonzero) digits is 21772800, while the sum is 55.

The spelling of 26706553440661 in words is "twenty-six trillion, seven hundred six billion, five hundred fifty-three million, four hundred forty thousand, six hundred sixty-one".