26877677861 has 4 divisors (see below), whose sum is σ = 27014112972. Its totient is φ = 26741242752.

The previous prime is 26877677843. The next prime is 26877677903. The reversal of 26877677861 is 16877677862.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24306680836 + 2570997025 = 155906^2 + 50705^2 .

It is a cyclic number.

It is not a de Polignac number, because 26877677861 - 2²² = 26873483557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26877677821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68217260 + ... + 68217653.

It is an arithmetic number, because the mean of its divisors is an integer number (6753528243).

Almost surely, 2^26877677861 is an apocalyptic number.

It is an amenable number.

26877677861 is a deficient number, since it is larger than the sum of its proper divisors (136435111).

26877677861 is a wasteful number, since it uses less digits than its factorization.

26877677861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136435110.

The product of its digits is 66382848, while the sum is 65.

Subtracting from 26877677861 its reverse (16877677862), we obtain a palindrome (9999999999).

The spelling of 26877677861 in words is "twenty-six billion, eight hundred seventy-seven million, six hundred seventy-seven thousand, eight hundred sixty-one".