266551611506401 has 8 divisors (see below), whose sum is σ = 287243077124864. Its totient is φ = 245886930959760.

The previous prime is 266551611506359. The next prime is 266551611506447. The reversal of 266551611506401 is 104605116155662.

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

It is a cyclic number.

It is not a de Polignac number, because 266551611506401 - 2²⁷ = 266551477288673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266558611506401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6696247281 + ... + 6696287086.

It is an arithmetic number, because the mean of its divisors is an integer number (35905384640608).

Almost surely, 2^{266551611506401} is an apocalyptic number.

It is an amenable number.

266551611506401 is a deficient number, since it is larger than the sum of its proper divisors (20691465618463).

266551611506401 is a wasteful number, since it uses less digits than its factorization.

266551611506401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13392535911.

The product of its (nonzero) digits is 1296000, while the sum is 49.

The spelling of 266551611506401 in words is "two hundred sixty-six trillion, five hundred fifty-one billion, six hundred eleven million, five hundred six thousand, four hundred one".