1266661677 has 4 divisors (see below), whose sum is σ = 1688882240. Its totient is φ = 844441116.

The previous prime is 1266661651. The next prime is 1266661699. The reversal of 1266661677 is 7761666621.

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 not a de Polignac number, because 1266661677 - 2⁷ = 1266661549 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 (1266661477) 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, 211110277 + ... + 211110282.

It is an arithmetic number, because the mean of its divisors is an integer number (422220560).

Almost surely, 2^1266661677 is an apocalyptic number.

It is an amenable number.

1266661677 is a deficient number, since it is larger than the sum of its proper divisors (422220563).

1266661677 is an equidigital number, since it uses as much as digits as its factorization.

1266661677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422220562.

The product of its digits is 762048, while the sum is 48.

The square root of 1266661677 is about 35590.1907412703. The cubic root of 1266661677 is about 1081.9824348006.

The spelling of 1266661677 in words is "one billion, two hundred sixty-six million, six hundred sixty-one thousand, six hundred seventy-seven".