26690419561 has 16 divisors (see below), whose sum is σ = 29078847616. Its totient is φ = 24350823936.

The previous prime is 26690419541. The next prime is 26690419571. The reversal of 26690419561 is 16591409662.

It is a cyclic number.

It is not a de Polignac number, because 26690419561 - 2⁷ = 26690419433 is a prime.

It is a super-2 number, since 2×26690419561² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (26690419501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 681241 + ... + 719353.

It is an arithmetic number, because the mean of its divisors is an integer number (1817427976).

Almost surely, 2^26690419561 is an apocalyptic number.

It is an amenable number.

26690419561 is a deficient number, since it is larger than the sum of its proper divisors (2388428055).

26690419561 is a wasteful number, since it uses less digits than its factorization.

26690419561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38752.

The product of its (nonzero) digits is 699840, while the sum is 49.

The spelling of 26690419561 in words is "twenty-six billion, six hundred ninety million, four hundred nineteen thousand, five hundred sixty-one".