266611142621 has 2 divisors, whose sum is σ = 266611142622. Its totient is φ = 266611142620.

The previous prime is 266611142597. The next prime is 266611142669. The reversal of 266611142621 is 126241116662.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 229714111225 + 36897031396 = 479285^2 + 192086^2 .

It is a cyclic number.

It is not a de Polignac number, because 266611142621 - 2²⁶ = 266544033757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266611142921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133305571310 + 133305571311.

It is an arithmetic number, because the mean of its divisors is an integer number (133305571311).

Almost surely, 2^266611142621 is an apocalyptic number.

It is an amenable number.

266611142621 is a deficient number, since it is larger than the sum of its proper divisors (1).

266611142621 is an equidigital number, since it uses as much as digits as its factorization.

266611142621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 38.

The spelling of 266611142621 in words is "two hundred sixty-six billion, six hundred eleven million, one hundred forty-two thousand, six hundred twenty-one".