1268843657851 has 16 divisors (see below), whose sum is σ = 1581963102720. Its totient is φ = 988691748480.

The previous prime is 1268843657839. The next prime is 1268843657863. The reversal of 1268843657851 is 1587563488621.

It is an interprime number because it is at equal distance from previous prime (1268843657839) and next prime (1268843657863).

It is a cyclic number.

It is not a de Polignac number, because 1268843657851 - 2³³ = 1260253723259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1268843657651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5725315 + ... + 5942803.

It is an arithmetic number, because the mean of its divisors is an integer number (98872693920).

Almost surely, 2^{1268843657851} is an apocalyptic number.

1268843657851 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1268843657851 is a deficient number, since it is larger than the sum of its proper divisors (313119444869).

1268843657851 is a wasteful number, since it uses less digits than its factorization.

1268843657851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293274.

The product of its digits is 77414400, while the sum is 64.

The spelling of 1268843657851 in words is "one trillion, two hundred sixty-eight billion, eight hundred forty-three million, six hundred fifty-seven thousand, eight hundred fifty-one".