26645551611 has 16 divisors (see below), whose sum is σ = 40922456064. Its totient is φ = 15106137984.

The previous prime is 26645551609. The next prime is 26645551633. The reversal of 26645551611 is 11615554662.

It is not a de Polignac number, because 26645551611 - 2¹ = 26645551609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26645551211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4992750 + ... + 4998083.

It is an arithmetic number, because the mean of its divisors is an integer number (2557653504).

Almost surely, 2^26645551611 is an apocalyptic number.

26645551611 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

26645551611 is a deficient number, since it is larger than the sum of its proper divisors (14276904453).

26645551611 is a wasteful number, since it uses less digits than its factorization.

26645551611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9990970.

The product of its digits is 216000, while the sum is 42.

The spelling of 26645551611 in words is "twenty-six billion, six hundred forty-five million, five hundred fifty-one thousand, six hundred eleven".