20751165173 has 2 divisors, whose sum is σ = 20751165174. Its totient is φ = 20751165172.

The previous prime is 20751165167. The next prime is 20751165187. The reversal of 20751165173 is 37156115702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16666293604 + 4084871569 = 129098^2 + 63913^2 .

It is a cyclic number.

It is not a de Polignac number, because 20751165173 - 2⁴ = 20751165157 is a prime.

It is a super-2 number, since 2×20751165173² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20751165103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10375582586 + 10375582587.

It is an arithmetic number, because the mean of its divisors is an integer number (10375582587).

Almost surely, 2^20751165173 is an apocalyptic number.

It is an amenable number.

20751165173 is a deficient number, since it is larger than the sum of its proper divisors (1).

20751165173 is an equidigital number, since it uses as much as digits as its factorization.

20751165173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 44100, while the sum is 38.

The spelling of 20751165173 in words is "twenty billion, seven hundred fifty-one million, one hundred sixty-five thousand, one hundred seventy-three".