866756979511 has 2 divisors, whose sum is σ = 866756979512. Its totient is φ = 866756979510.

The previous prime is 866756979499. The next prime is 866756979521. The reversal of 866756979511 is 115979657668.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 866756979511 - 2¹³ = 866756971319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866756979521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433378489755 + 433378489756.

It is an arithmetic number, because the mean of its divisors is an integer number (433378489756).

Almost surely, 2^866756979511 is an apocalyptic number.

866756979511 is a deficient number, since it is larger than the sum of its proper divisors (1).

866756979511 is an equidigital number, since it uses as much as digits as its factorization.

866756979511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 171460800, while the sum is 70.

The spelling of 866756979511 in words is "eight hundred sixty-six billion, seven hundred fifty-six million, nine hundred seventy-nine thousand, five hundred eleven".