1266521629 has 2 divisors, whose sum is σ = 1266521630. Its totient is φ = 1266521628.

The previous prime is 1266521621. The next prime is 1266521677. The reversal of 1266521629 is 9261256621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1218149604 + 48372025 = 34902^2 + 6955^2 .

It is a cyclic number.

It is not a de Polignac number, because 1266521629 - 2³ = 1266521621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1266521591 and 1266521600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1266521621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633260814 + 633260815.

It is an arithmetic number, because the mean of its divisors is an integer number (633260815).

Almost surely, 2^1266521629 is an apocalyptic number.

It is an amenable number.

1266521629 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266521629 is an equidigital number, since it uses as much as digits as its factorization.

1266521629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 40.

The square root of 1266521629 is about 35588.2231784617. The cubic root of 1266521629 is about 1081.9425569959.

The spelling of 1266521629 in words is "one billion, two hundred sixty-six million, five hundred twenty-one thousand, six hundred twenty-nine".