26516665557 has 12 divisors (see below), whose sum is σ = 38303332704. Its totient is φ = 17677092840.

The previous prime is 26516665537. The next prime is 26516665561. The reversal of 26516665557 is 75556661562.

It is not a de Polignac number, because 26516665557 - 2⁶ = 26516665493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26516665537) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 318832 + ... + 393302.

It is an arithmetic number, because the mean of its divisors is an integer number (3191944392).

Almost surely, 2^26516665557 is an apocalyptic number.

It is an amenable number.

26516665557 is a deficient number, since it is larger than the sum of its proper divisors (11786667147).

26516665557 is a wasteful number, since it uses less digits than its factorization.

26516665557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114040 (or 114037 counting only the distinct ones).

The product of its digits is 11340000, while the sum is 54.

The spelling of 26516665557 in words is "twenty-six billion, five hundred sixteen million, six hundred sixty-five thousand, five hundred fifty-seven".