266820976087 has 4 divisors (see below), whose sum is σ = 266950944520. Its totient is φ = 266691007656.

The previous prime is 266820976057. The next prime is 266820976117. The reversal of 266820976087 is 780679028662.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (266820976057) and next prime (266820976117).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266820976087 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 (266820976057) 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, 64981137 + ... + 64985242.

It is an arithmetic number, because the mean of its divisors is an integer number (66737736130).

Almost surely, 2^266820976087 is an apocalyptic number.

266820976087 is a deficient number, since it is larger than the sum of its proper divisors (129968433).

266820976087 is a wasteful number, since it uses less digits than its factorization.

266820976087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129968432.

The product of its (nonzero) digits is 24385536, while the sum is 61.

The spelling of 266820976087 in words is "two hundred sixty-six billion, eight hundred twenty million, nine hundred seventy-six thousand, eighty-seven".