26156366561 has 16 divisors (see below), whose sum is σ = 28402281600. Its totient is φ = 23944249728.

The previous prime is 26156366507. The next prime is 26156366563. The reversal of 26156366561 is 16566365162.

It is a cyclic number.

It is not a de Polignac number, because 26156366561 - 2³⁴ = 8976497377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26156366563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1739885 + ... + 1754853.

It is an arithmetic number, because the mean of its divisors is an integer number (1775142600).

Almost surely, 2^26156366561 is an apocalyptic number.

It is an amenable number.

26156366561 is a deficient number, since it is larger than the sum of its proper divisors (2245915039).

26156366561 is a wasteful number, since it uses less digits than its factorization.

26156366561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16088.

The product of its digits is 1166400, while the sum is 47.

The spelling of 26156366561 in words is "twenty-six billion, one hundred fifty-six million, three hundred sixty-six thousand, five hundred sixty-one".