20255167171617 has 64 divisors (see below), whose sum is σ = 32523886264320. Its totient is φ = 10969293384000.

The previous prime is 20255167171573. The next prime is 20255167171661. The reversal of 20255167171617 is 71617176155202.

It is an interprime number because it is at equal distance from previous prime (20255167171573) and next prime (20255167171661).

It is not a de Polignac number, because 20255167171617 - 2⁷ = 20255167171489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20255167171617.

It is not an unprimeable number, because it can be changed into a prime (20255167151617) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9098992 + ... + 11104142.

It is an arithmetic number, because the mean of its divisors is an integer number (508185722880).

Almost surely, 2^{20255167171617} is an apocalyptic number.

It is an amenable number.

20255167171617 is a deficient number, since it is larger than the sum of its proper divisors (12268719092703).

20255167171617 is a wasteful number, since it uses less digits than its factorization.

20255167171617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2005514.

The product of its (nonzero) digits is 1234800, while the sum is 51.

The spelling of 20255167171617 in words is "twenty trillion, two hundred fifty-five billion, one hundred sixty-seven million, one hundred seventy-one thousand, six hundred seventeen".