266690480981 has 4 divisors (see below), whose sum is σ = 266695198752. Its totient is φ = 266685763212.

The previous prime is 266690480921. The next prime is 266690480993. The reversal of 266690480981 is 189084096662.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 266690480981 - 2²² = 266686286677 is a prime.

It is a super-2 number, since 2×266690480981² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 266690480981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266690480921) 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, 2273051 + ... + 2387496.

It is an arithmetic number, because the mean of its divisors is an integer number (66673799688).

Almost surely, 2^266690480981 is an apocalyptic number.

It is an amenable number.

266690480981 is a deficient number, since it is larger than the sum of its proper divisors (4717771).

266690480981 is an equidigital number, since it uses as much as digits as its factorization.

266690480981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4717770.

The product of its (nonzero) digits is 8957952, while the sum is 59.

The spelling of 266690480981 in words is "two hundred sixty-six billion, six hundred ninety million, four hundred eighty thousand, nine hundred eighty-one".