1266257243 has 8 divisors (see below), whose sum is σ = 1300831056. Its totient is φ = 1231859200.

The previous prime is 1266257231. The next prime is 1266257263. The reversal of 1266257243 is 3427526621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1266257243 - 2⁸ = 1266256987 is a prime.

It is a super-2 number, since 2×1266257243² = 3206814810899922098, 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 = 1266257197 and 1266257206.

It is not an unprimeable number, because it can be changed into a prime (1266257263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29273 + ... + 58218.

It is an arithmetic number, because the mean of its divisors is an integer number (162603882).

Almost surely, 2^1266257243 is an apocalyptic number.

1266257243 is a deficient number, since it is larger than the sum of its proper divisors (34573813).

1266257243 is an equidigital number, since it uses as much as digits as its factorization.

1266257243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87885.

The product of its digits is 120960, while the sum is 38.

The square root of 1266257243 is about 35584.5084692763. The cubic root of 1266257243 is about 1081.8672666982.

The spelling of 1266257243 in words is "one billion, two hundred sixty-six million, two hundred fifty-seven thousand, two hundred forty-three".