26722269891 has 12 divisors (see below), whose sum is σ = 39496482168. Its totient is φ = 17400547584.

The previous prime is 26722269887. The next prime is 26722269941. The reversal of 26722269891 is 19896222762.

It is not a de Polignac number, because 26722269891 - 2² = 26722269887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26722269811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34524510 + ... + 34525283.

It is an arithmetic number, because the mean of its divisors is an integer number (3291373514).

Almost surely, 2^26722269891 is an apocalyptic number.

26722269891 is a deficient number, since it is larger than the sum of its proper divisors (12774212277).

26722269891 is a wasteful number, since it uses less digits than its factorization.

26722269891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69049842 (or 69049839 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The spelling of 26722269891 in words is "twenty-six billion, seven hundred twenty-two million, two hundred sixty-nine thousand, eight hundred ninety-one".