1266215497 has 2 divisors, whose sum is σ = 1266215498. Its totient is φ = 1266215496.

The previous prime is 1266215413. The next prime is 1266215507. The reversal of 1266215497 is 7945126621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1266007561 + 207936 = 35581^2 + 456^2 .

It is a cyclic number.

It is not a de Polignac number, because 1266215497 - 2¹⁹ = 1265691209 is a prime.

It is not a weakly prime, because it can be changed into another prime (1266215407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633107748 + 633107749.

It is an arithmetic number, because the mean of its divisors is an integer number (633107749).

Almost surely, 2^1266215497 is an apocalyptic number.

It is an amenable number.

1266215497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266215497 is an equidigital number, since it uses as much as digits as its factorization.

1266215497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 43.

The square root of 1266215497 is about 35583.9218889655. The cubic root of 1266215497 is about 1081.8553775586.

The spelling of 1266215497 in words is "one billion, two hundred sixty-six million, two hundred fifteen thousand, four hundred ninety-seven".