18775027656257 has 16 divisors (see below), whose sum is σ = 18887477778000. Its totient is φ = 18662852812800.

The previous prime is 18775027656227. The next prime is 18775027656311. The reversal of 18775027656257 is 75265672057781.

It is a Cunningham number, because it is equal to 4333016²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 38171781376 + 18736855874881 = 195376^2 + 4328609^2 .

It is a cyclic number.

It is not a de Polignac number, because 18775027656257 - 2⁸ = 18775027656001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18775027656227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1420514513 + ... + 1420527729.

It is an arithmetic number, because the mean of its divisors is an integer number (1180467361125).

Almost surely, 2^{18775027656257} is an apocalyptic number.

It is an amenable number.

18775027656257 is a deficient number, since it is larger than the sum of its proper divisors (112450121743).

18775027656257 is a wasteful number, since it uses less digits than its factorization.

18775027656257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22996.

The product of its (nonzero) digits is 345744000, while the sum is 68.

The spelling of 18775027656257 in words is "eighteen trillion, seven hundred seventy-five billion, twenty-seven million, six hundred fifty-six thousand, two hundred fifty-seven".