1266039953 has 2 divisors, whose sum is σ = 1266039954. Its totient is φ = 1266039952.

The previous prime is 1266039911. The next prime is 1266039961. The reversal of 1266039953 is 3599306621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 796537729 + 469502224 = 28223^2 + 21668^2 .

It is an emirp because it is prime and its reverse (3599306621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1266039953 - 2⁶ = 1266039889 is a prime.

It is not a weakly prime, because it can be changed into another prime (1266039353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633019976 + 633019977.

It is an arithmetic number, because the mean of its divisors is an integer number (633019977).

Almost surely, 2^1266039953 is an apocalyptic number.

It is an amenable number.

1266039953 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266039953 is an equidigital number, since it uses as much as digits as its factorization.

1266039953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 262440, while the sum is 44.

The square root of 1266039953 is about 35581.4551838454. The cubic root of 1266039953 is about 1081.8053802773.

The spelling of 1266039953 in words is "one billion, two hundred sixty-six million, thirty-nine thousand, nine hundred fifty-three".