1266805051 has 4 divisors (see below), whose sum is σ = 1268534032. Its totient is φ = 1265076072.

The previous prime is 1266805027. The next prime is 1266805079. The reversal of 1266805051 is 1505086621.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1266805051 - 2²⁵ = 1233250619 is a prime.

It is a super-2 number, since 2×1266805051² = 3209590074478225202, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1266804998 and 1266805016.

It is not an unprimeable number, because it can be changed into a prime (1266805091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 863391 + ... + 864856.

It is an arithmetic number, because the mean of its divisors is an integer number (317133508).

Almost surely, 2^1266805051 is an apocalyptic number.

1266805051 is a deficient number, since it is larger than the sum of its proper divisors (1728981).

1266805051 is an equidigital number, since it uses as much as digits as its factorization.

1266805051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1728980.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 1266805051 is about 35592.2049190550. The cubic root of 1266805051 is about 1082.0232566185.

The spelling of 1266805051 in words is "one billion, two hundred sixty-six million, eight hundred five thousand, fifty-one".