26277878761 has 2 divisors, whose sum is σ = 26277878762. Its totient is φ = 26277878760.

The previous prime is 26277878723. The next prime is 26277878789. The reversal of 26277878761 is 16787877262.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24694236736 + 1583642025 = 157144^2 + 39795^2 .

It is a cyclic number.

It is not a de Polignac number, because 26277878761 - 2⁷ = 26277878633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26277878761.

It is not a weakly prime, because it can be changed into another prime (26277878701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13138939380 + 13138939381.

It is an arithmetic number, because the mean of its divisors is an integer number (13138939381).

Almost surely, 2^26277878761 is an apocalyptic number.

It is an amenable number.

26277878761 is a deficient number, since it is larger than the sum of its proper divisors (1).

26277878761 is an equidigital number, since it uses as much as digits as its factorization.

26277878761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22127616, while the sum is 61.

The spelling of 26277878761 in words is "twenty-six billion, two hundred seventy-seven million, eight hundred seventy-eight thousand, seven hundred sixty-one".