1268761601 has 2 divisors, whose sum is σ = 1268761602. Its totient is φ = 1268761600.

The previous prime is 1268761597. The next prime is 1268761607. The reversal of 1268761601 is 1061678621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1038450625 + 230310976 = 32225^2 + 15176^2 .

It is a cyclic number.

It is not a de Polignac number, because 1268761601 - 2² = 1268761597 is a prime.

It is not a weakly prime, because it can be changed into another prime (1268761607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634380800 + 634380801.

It is an arithmetic number, because the mean of its divisors is an integer number (634380801).

Almost surely, 2^1268761601 is an apocalyptic number.

It is an amenable number.

1268761601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268761601 is an equidigital number, since it uses as much as digits as its factorization.

1268761601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 1268761601 is about 35619.6799676808. The cubic root of 1268761601 is about 1082.5800230637.

The spelling of 1268761601 in words is "one billion, two hundred sixty-eight million, seven hundred sixty-one thousand, six hundred one".