1267823865881 has 2 divisors, whose sum is σ = 1267823865882. Its totient is φ = 1267823865880.

The previous prime is 1267823865851. The next prime is 1267823865899. The reversal of 1267823865881 is 1885683287621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1242957414400 + 24866451481 = 1114880^2 + 157691^2 .

It is a cyclic number.

It is not a de Polignac number, because 1267823865881 - 2³⁸ = 992945958937 is a prime.

It is a super-2 number, since 2×1267823865881² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1267823865851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633911932940 + 633911932941.

It is an arithmetic number, because the mean of its divisors is an integer number (633911932941).

Almost surely, 2^{1267823865881} is an apocalyptic number.

It is an amenable number.

1267823865881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1267823865881 is an equidigital number, since it uses as much as digits as its factorization.

1267823865881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61931520, while the sum is 65.

The spelling of 1267823865881 in words is "one trillion, two hundred sixty-seven billion, eight hundred twenty-three million, eight hundred sixty-five thousand, eight hundred eighty-one".