1266804981 has 32 divisors (see below), whose sum is σ = 2024574720. Its totient is φ = 778237632.

The previous prime is 1266804961. The next prime is 1266804991. The reversal of 1266804981 is 1894086621.

1266804981 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1266804981 - 2⁵ = 1266804949 is a prime.

It is a super-2 number, since 2×1266804981² = 3209589719772820722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266804901) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 226440 + ... + 231966.

It is an arithmetic number, because the mean of its divisors is an integer number (63267960).

Almost surely, 2^1266804981 is an apocalyptic number.

It is an amenable number.

1266804981 is a deficient number, since it is larger than the sum of its proper divisors (757769739).

1266804981 is a wasteful number, since it uses less digits than its factorization.

1266804981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6202 (or 6196 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 1266804981 is about 35592.2039356936. The cubic root of 1266804981 is about 1082.0232366887.

The spelling of 1266804981 in words is "one billion, two hundred sixty-six million, eight hundred four thousand, nine hundred eighty-one".