26557166157 has 4 divisors (see below), whose sum is σ = 35409554880. Its totient is φ = 17704777436.

The previous prime is 26557166107. The next prime is 26557166159. The reversal of 26557166157 is 75166175562.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 26557166157 - 2²² = 26552971853 is a prime.

It is a super-2 number, since 2×26557166157² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26557166159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4426194357 + ... + 4426194362.

It is an arithmetic number, because the mean of its divisors is an integer number (8852388720).

Almost surely, 2^26557166157 is an apocalyptic number.

It is an amenable number.

26557166157 is a deficient number, since it is larger than the sum of its proper divisors (8852388723).

26557166157 is an equidigital number, since it uses as much as digits as its factorization.

26557166157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8852388722.

The product of its digits is 2646000, while the sum is 51.

The spelling of 26557166157 in words is "twenty-six billion, five hundred fifty-seven million, one hundred sixty-six thousand, one hundred fifty-seven".