266054465036021 has 4 divisors (see below), whose sum is σ = 266089139156172. Its totient is φ = 266019790915872.

The previous prime is 266054465035969. The next prime is 266054465036071. The reversal of 266054465036021 is 120630564450662.

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 119719814139025 + 146334650896996 = 10941655^2 + 12096886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266054465036021 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 (266054465036071) 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, 17337048566 + ... + 17337063911.

It is an arithmetic number, because the mean of its divisors is an integer number (66522284789043).

Almost surely, 2^{266054465036021} is an apocalyptic number.

It is an amenable number.

266054465036021 is a deficient number, since it is larger than the sum of its proper divisors (34674120151).

266054465036021 is an equidigital number, since it uses as much as digits as its factorization.

266054465036021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34674120150.

The product of its (nonzero) digits is 6220800, while the sum is 50.

The spelling of 266054465036021 in words is "two hundred sixty-six trillion, fifty-four billion, four hundred sixty-five million, thirty-six thousand, twenty-one".