26166056454691 has 4 divisors (see below), whose sum is σ = 26167161883984. Its totient is φ = 26164951025400.

The previous prime is 26166056454683. The next prime is 26166056454739. The reversal of 26166056454691 is 19645465066162.

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

It is a cyclic number.

It is not a de Polignac number, because 26166056454691 - 2³ = 26166056454683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26166056454641) 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, 552679140 + ... + 552726481.

It is an arithmetic number, because the mean of its divisors is an integer number (6541790470996).

Almost surely, 2^{26166056454691} is an apocalyptic number.

26166056454691 is a deficient number, since it is larger than the sum of its proper divisors (1105429293).

26166056454691 is a wasteful number, since it uses less digits than its factorization.

26166056454691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105429292.

The product of its (nonzero) digits is 55987200, while the sum is 61.

The spelling of 26166056454691 in words is "twenty-six trillion, one hundred sixty-six billion, fifty-six million, four hundred fifty-four thousand, six hundred ninety-one".