1268901553 has 2 divisors, whose sum is σ = 1268901554. Its totient is φ = 1268901552.

The previous prime is 1268901509. The next prime is 1268901581. The reversal of 1268901553 is 3551098621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1033493904 + 235407649 = 32148^2 + 15343^2 .

It is a cyclic number.

It is not a de Polignac number, because 1268901553 - 2²¹ = 1266804401 is a prime.

It is a super-2 number, since 2×1268901553² = 3220222302411623618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1268901503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634450776 + 634450777.

It is an arithmetic number, because the mean of its divisors is an integer number (634450777).

Almost surely, 2^1268901553 is an apocalyptic number.

It is an amenable number.

1268901553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268901553 is an equidigital number, since it uses as much as digits as its factorization.

1268901553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 1268901553 is about 35621.6444454772. The cubic root of 1268901553 is about 1082.6198266193.

The spelling of 1268901553 in words is "one billion, two hundred sixty-eight million, nine hundred one thousand, five hundred fifty-three".