20661751167 has 8 divisors (see below), whose sum is σ = 27558286080. Its totient is φ = 13769858520.

The previous prime is 20661751157. The next prime is 20661751177. The reversal of 20661751167 is 76115716602.

It is an interprime number because it is at equal distance from previous prime (20661751157) and next prime (20661751177).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20661751167 - 2⁸ = 20661750911 is a prime.

It is a super-2 number, since 2×20661751167² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20661751157) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1150167 + ... + 1167992.

It is an arithmetic number, because the mean of its divisors is an integer number (3444785760).

Almost surely, 2^20661751167 is an apocalyptic number.

20661751167 is a deficient number, since it is larger than the sum of its proper divisors (6896534913).

20661751167 is a wasteful number, since it uses less digits than its factorization.

20661751167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2321133.

The product of its (nonzero) digits is 105840, while the sum is 42.

The spelling of 20661751167 in words is "twenty billion, six hundred sixty-one million, seven hundred fifty-one thousand, one hundred sixty-seven".