26863537801 has 3 divisors (see below), whose sum is σ = 26863701703. Its totient is φ = 26863373900.

The previous prime is 26863537783. The next prime is 26863537817. The reversal of 26863537801 is 10873536862.

The square root of 26863537801 is 163901.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 10873536862 = 2 ⋅5436768431.

It can be written as a sum of positive squares in only one way, i.e., 13421454201 + 13442083600 = 115851^2 + 115940^2 .

It is not a de Polignac number, because 26863537801 - 2¹⁵ = 26863505033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26863537871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 81951 + ... + 245851.

Almost surely, 2^26863537801 is an apocalyptic number.

26863537801 is the 163901-st square number.

26863537801 is the 81951-st centered octagonal number.

It is an amenable number.

26863537801 is a deficient number, since it is larger than the sum of its proper divisors (163902).

26863537801 is an frugal number, since it uses more digits than its factorization.

26863537801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327802 (or 163901 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 49.

Multiplying 26863537801 by its sum of digits (49), we get a square (1316313352249 = 1147307²).

The spelling of 26863537801 in words is "twenty-six billion, eight hundred sixty-three million, five hundred thirty-seven thousand, eight hundred one".