1266055993 has 4 divisors (see below), whose sum is σ = 1277888400. Its totient is φ = 1254223588.

The previous prime is 1266055991. The next prime is 1266056003. The reversal of 1266055993 is 3995506621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3995506621 = 41 ⋅97451381.

It is a cyclic number.

It is not a de Polignac number, because 1266055993 - 2¹ = 1266055991 is a prime.

It is a super-2 number, since 2×1266055993² = 3205795554822432098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1266055991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5916043 + ... + 5916256.

It is an arithmetic number, because the mean of its divisors is an integer number (319472100).

Almost surely, 2^1266055993 is an apocalyptic number.

It is an amenable number.

1266055993 is a deficient number, since it is larger than the sum of its proper divisors (11832407).

1266055993 is a wasteful number, since it uses less digits than its factorization.

1266055993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11832406.

The product of its (nonzero) digits is 437400, while the sum is 46.

The square root of 1266055993 is about 35581.6805814453. The cubic root of 1266055993 is about 1081.8099488759.

The spelling of 1266055993 in words is "one billion, two hundred sixty-six million, fifty-five thousand, nine hundred ninety-three".