26805622561 has 8 divisors (see below), whose sum is σ = 26938092384. Its totient is φ = 26673279360.

The previous prime is 26805622537. The next prime is 26805622567. The reversal of 26805622561 is 16522650862.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 26805622561 - 2¹⁹ = 26805098273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26805622567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 407761 + ... + 468913.

It is an arithmetic number, because the mean of its divisors is an integer number (3367261548).

Almost surely, 2^26805622561 is an apocalyptic number.

It is an amenable number.

26805622561 is a deficient number, since it is larger than the sum of its proper divisors (132469823).

26805622561 is a wasteful number, since it uses less digits than its factorization.

26805622561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63311.

The product of its (nonzero) digits is 345600, while the sum is 43.

The spelling of 26805622561 in words is "twenty-six billion, eight hundred five million, six hundred twenty-two thousand, five hundred sixty-one".