26878156831 has 2 divisors, whose sum is σ = 26878156832. Its totient is φ = 26878156830.

The previous prime is 26878156787. The next prime is 26878156843. The reversal of 26878156831 is 13865187862.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26878156831 - 2³¹ = 24730673183 is a prime.

It is a super-2 number, since 2×26878156831² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26878156861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13439078415 + 13439078416.

It is an arithmetic number, because the mean of its divisors is an integer number (13439078416).

Almost surely, 2^26878156831 is an apocalyptic number.

26878156831 is a deficient number, since it is larger than the sum of its proper divisors (1).

26878156831 is an equidigital number, since it uses as much as digits as its factorization.

26878156831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3870720, while the sum is 55.

It can be divided in two parts, 2687 and 8156831, that added together give a palindrome (8159518).

The spelling of 26878156831 in words is "twenty-six billion, eight hundred seventy-eight million, one hundred fifty-six thousand, eight hundred thirty-one".