20751165111 has 4 divisors (see below), whose sum is σ = 27668220152. Its totient is φ = 13834110072.

The previous prime is 20751165103. The next prime is 20751165121. The reversal of 20751165111 is 11156115702.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20751165111 - 2³ = 20751165103 is a prime.

It is a super-2 number, since 2×20751165111² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20751165121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3458527516 + ... + 3458527521.

It is an arithmetic number, because the mean of its divisors is an integer number (6917055038).

Almost surely, 2^20751165111 is an apocalyptic number.

20751165111 is a deficient number, since it is larger than the sum of its proper divisors (6917055041).

20751165111 is an equidigital number, since it uses as much as digits as its factorization.

20751165111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6917055040.

The product of its (nonzero) digits is 2100, while the sum is 30.

The spelling of 20751165111 in words is "twenty billion, seven hundred fifty-one million, one hundred sixty-five thousand, one hundred eleven".