266804705577493 has 2 divisors, whose sum is σ = 266804705577494. Its totient is φ = 266804705577492.

The previous prime is 266804705577467. The next prime is 266804705577517. The reversal of 266804705577493 is 394775507408662.

266804705577493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155436511586724 + 111368193990769 = 12467418^2 + 10553113^2 .

It is a cyclic number.

It is not a de Polignac number, because 266804705577493 - 2⁴¹ = 264605682321941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266804705547493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133402352788746 + 133402352788747.

It is an arithmetic number, because the mean of its divisors is an integer number (133402352788747).

Almost surely, 2^{266804705577493} is an apocalyptic number.

It is an amenable number.

266804705577493 is a deficient number, since it is larger than the sum of its proper divisors (1).

266804705577493 is an equidigital number, since it uses as much as digits as its factorization.

266804705577493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2133734400, while the sum is 73.

The spelling of 266804705577493 in words is "two hundred sixty-six trillion, eight hundred four billion, seven hundred five million, five hundred seventy-seven thousand, four hundred ninety-three".