1266376864 has 12 divisors (see below), whose sum is σ = 2493179514. Its totient is φ = 633188416.

The previous prime is 1266376831. The next prime is 1266376871. The reversal of 1266376864 is 4686736621.

It can be written as a sum of positive squares in only one way, i.e., 1240448400 + 25928464 = 35220^2 + 5092^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19787107 + ... + 19787170.

Almost surely, 2^1266376864 is an apocalyptic number.

It is an amenable number.

1266376864 is a deficient number, since it is larger than the sum of its proper divisors (1226802650).

1266376864 is an equidigital number, since it uses as much as digits as its factorization.

1266376864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39574287 (or 39574279 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 49.

The square root of 1266376864 is about 35586.1892312172. The cubic root of 1266376864 is about 1081.9013329645.

The spelling of 1266376864 in words is "one billion, two hundred sixty-six million, three hundred seventy-six thousand, eight hundred sixty-four".