1266437929213 has 4 divisors (see below), whose sum is σ = 1267536315388. Its totient is φ = 1265339543040.

The previous prime is 1266437929199. The next prime is 1266437929231. The reversal of 1266437929213 is 3129297346621.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 709499613124 + 556938316089 = 842318^2 + 746283^2 .

It is a cyclic number.

It is not a de Polignac number, because 1266437929213 - 2¹⁷ = 1266437798141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266437921213) 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, 549191358 + ... + 549193663.

It is an arithmetic number, because the mean of its divisors is an integer number (316884078847).

Almost surely, 2^{1266437929213} is an apocalyptic number.

It is an amenable number.

1266437929213 is a deficient number, since it is larger than the sum of its proper divisors (1098386175).

1266437929213 is a wasteful number, since it uses less digits than its factorization.

1266437929213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1098386174.

The product of its digits is 5878656, while the sum is 55.

The spelling of 1266437929213 in words is "one trillion, two hundred sixty-six billion, four hundred thirty-seven million, nine hundred twenty-nine thousand, two hundred thirteen".