1266650655 has 16 divisors (see below), whose sum is σ = 2028826464. Its totient is φ = 674818560.

The previous prime is 1266650653. The next prime is 1266650683. The reversal of 1266650655 is 5560566621.

It is not a de Polignac number, because 1266650655 - 2¹ = 1266650653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266650653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31006 + ... + 59115.

It is an arithmetic number, because the mean of its divisors is an integer number (126801654).

Almost surely, 2^1266650655 is an apocalyptic number.

1266650655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1266650655 is a deficient number, since it is larger than the sum of its proper divisors (762175809).

1266650655 is an equidigital number, since it uses as much as digits as its factorization.

1266650655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91066.

The product of its (nonzero) digits is 324000, while the sum is 42.

The square root of 1266650655 is about 35590.0358948962. The cubic root of 1266650655 is about 1081.9792964606.

The spelling of 1266650655 in words is "one billion, two hundred sixty-six million, six hundred fifty thousand, six hundred fifty-five".