1268817817 has 8 divisors (see below), whose sum is σ = 1318426112. Its totient is φ = 1219752000.

The previous prime is 1268817749. The next prime is 1268817821. The reversal of 1268817817 is 7187188621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1268817817 - 2⁷ = 1268817689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1268817887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130848 + ... + 140209.

It is an arithmetic number, because the mean of its divisors is an integer number (164803264).

Almost surely, 2^1268817817 is an apocalyptic number.

It is an amenable number.

1268817817 is a deficient number, since it is larger than the sum of its proper divisors (49608295).

1268817817 is a wasteful number, since it uses less digits than its factorization.

1268817817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271239.

The product of its digits is 301056, while the sum is 49.

The square root of 1268817817 is about 35620.4690732730. The cubic root of 1268817817 is about 1082.5960117306.

The spelling of 1268817817 in words is "one billion, two hundred sixty-eight million, eight hundred seventeen thousand, eight hundred seventeen".