1266207081 has 16 divisors (see below), whose sum is σ = 1754808384. Its totient is φ = 811422144.

The previous prime is 1266207053. The next prime is 1266207091. The reversal of 1266207081 is 1807026621.

It is not a de Polignac number, because 1266207081 - 2¹³ = 1266198889 is a prime.

It is a super-2 number, since 2×1266207081² = 3206560743949081122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1266207031) 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, 59506 + ... + 77931.

It is an arithmetic number, because the mean of its divisors is an integer number (109675524).

Almost surely, 2^1266207081 is an apocalyptic number.

It is an amenable number.

1266207081 is a deficient number, since it is larger than the sum of its proper divisors (488601303).

1266207081 is a wasteful number, since it uses less digits than its factorization.

1266207081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137560.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 1266207081 is about 35583.8036331138. The cubic root of 1266207081 is about 1081.8529806746.

The spelling of 1266207081 in words is "one billion, two hundred sixty-six million, two hundred seven thousand, eighty-one".