1264196657 has 2 divisors, whose sum is σ = 1264196658. Its totient is φ = 1264196656.

The previous prime is 1264196611. The next prime is 1264196693. The reversal of 1264196657 is 7566914621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 634989601 + 629207056 = 25199^2 + 25084^2 .

It is a cyclic number.

It is not a de Polignac number, because 1264196657 - 2¹⁴ = 1264180273 is a prime.

It is not a weakly prime, because it can be changed into another prime (1264193657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632098328 + 632098329.

It is an arithmetic number, because the mean of its divisors is an integer number (632098329).

Almost surely, 2^1264196657 is an apocalyptic number.

It is an amenable number.

1264196657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264196657 is an equidigital number, since it uses as much as digits as its factorization.

1264196657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 47.

The square root of 1264196657 is about 35555.5432668382. The cubic root of 1264196657 is about 1081.2801056271.

The spelling of 1264196657 in words is "one billion, two hundred sixty-four million, one hundred ninety-six thousand, six hundred fifty-seven".