26122101561 has 20 divisors (see below), whose sum is σ = 39033229312. Its totient is φ = 17409680568.

The previous prime is 26122101557. The next prime is 26122101601. The reversal of 26122101561 is 16510122162.

It is not a de Polignac number, because 26122101561 - 2² = 26122101557 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26122101541) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 245220 + ... + 335226.

Almost surely, 2^26122101561 is an apocalyptic number.

It is an amenable number.

26122101561 is a deficient number, since it is larger than the sum of its proper divisors (12911127751).

26122101561 is an equidigital number, since it uses as much as digits as its factorization.

26122101561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93602 (or 93593 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The spelling of 26122101561 in words is "twenty-six billion, one hundred twenty-two million, one hundred one thousand, five hundred sixty-one".