1266761611 has 2 divisors, whose sum is σ = 1266761612. Its totient is φ = 1266761610.

The previous prime is 1266761599. The next prime is 1266761621. The reversal of 1266761611 is 1161676621.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1266761611 is a prime.

It is not a weakly prime, because it can be changed into another prime (1266761621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633380805 + 633380806.

It is an arithmetic number, because the mean of its divisors is an integer number (633380806).

Almost surely, 2^1266761611 is an apocalyptic number.

1266761611 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266761611 is an equidigital number, since it uses as much as digits as its factorization.

1266761611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 37.

The square root of 1266761611 is about 35591.5946678426. The cubic root of 1266761611 is about 1082.0108885941.

The spelling of 1266761611 in words is "one billion, two hundred sixty-six million, seven hundred sixty-one thousand, six hundred eleven".