1266438674 has 4 divisors (see below), whose sum is σ = 1899658014. Its totient is φ = 633219336.

The previous prime is 1266438659. The next prime is 1266438683. The reversal of 1266438674 is 4768346621.

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

It can be written as a sum of positive squares in only one way, i.e., 786522025 + 479916649 = 28045^2 + 21907^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 316609667 + ... + 316609670.

Almost surely, 2^1266438674 is an apocalyptic number.

1266438674 is a deficient number, since it is larger than the sum of its proper divisors (633219340).

1266438674 is an equidigital number, since it uses as much as digits as its factorization.

1266438674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633219339.

The product of its digits is 1161216, while the sum is 47.

The square root of 1266438674 is about 35587.0576755089. The cubic root of 1266438674 is about 1081.9189346846.

The spelling of 1266438674 in words is "one billion, two hundred sixty-six million, four hundred thirty-eight thousand, six hundred seventy-four".