266931374977 has 2 divisors, whose sum is σ = 266931374978. Its totient is φ = 266931374976.

The previous prime is 266931374939. The next prime is 266931374993. The reversal of 266931374977 is 779473139662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160287328881 + 106644046096 = 400359^2 + 326564^2 .

It is a cyclic number.

It is not a de Polignac number, because 266931374977 - 2³¹ = 264783891329 is a prime.

It is a super-2 number, since 2×266931374977² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (266931374917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133465687488 + 133465687489.

It is an arithmetic number, because the mean of its divisors is an integer number (133465687489).

Almost surely, 2^266931374977 is an apocalyptic number.

It is an amenable number.

266931374977 is a deficient number, since it is larger than the sum of its proper divisors (1).

266931374977 is an equidigital number, since it uses as much as digits as its factorization.

266931374977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72013536, while the sum is 64.

The spelling of 266931374977 in words is "two hundred sixty-six billion, nine hundred thirty-one million, three hundred seventy-four thousand, nine hundred seventy-seven".