1266155205 has 16 divisors (see below), whose sum is σ = 2315255424. Its totient is φ = 578813760.

The previous prime is 1266155203. The next prime is 1266155237. The reversal of 1266155205 is 5025516621.

It is not a de Polignac number, because 1266155205 - 2¹ = 1266155203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266155201) 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, 6029206 + ... + 6029415.

It is an arithmetic number, because the mean of its divisors is an integer number (144703464).

Almost surely, 2^1266155205 is an apocalyptic number.

1266155205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1266155205 is a deficient number, since it is larger than the sum of its proper divisors (1049100219).

1266155205 is a wasteful number, since it uses less digits than its factorization.

1266155205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12058636.

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 1266155205 is about 35583.0746985136. The cubic root of 1266155205 is about 1081.8382061109.

The spelling of 1266155205 in words is "one billion, two hundred sixty-six million, one hundred fifty-five thousand, two hundred five".