1266736351 has 4 divisors (see below), whose sum is σ = 1341250272. Its totient is φ = 1192222432.

The previous prime is 1266736349. The next prime is 1266736381. The reversal of 1266736351 is 1536376621.

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 1266736351 - 2¹ = 1266736349 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266736321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37256935 + ... + 37256968.

It is an arithmetic number, because the mean of its divisors is an integer number (335312568).

Almost surely, 2^1266736351 is an apocalyptic number.

1266736351 is a deficient number, since it is larger than the sum of its proper divisors (74513921).

1266736351 is an equidigital number, since it uses as much as digits as its factorization.

1266736351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74513920.

The product of its digits is 136080, while the sum is 40.

The square root of 1266736351 is about 35591.2398070087. The cubic root of 1266736351 is about 1082.0036965603.

The spelling of 1266736351 in words is "one billion, two hundred sixty-six million, seven hundred thirty-six thousand, three hundred fifty-one".