12157105511 has 4 divisors (see below), whose sum is σ = 12157356000. Its totient is φ = 12156855024.

The previous prime is 12157105463. The next prime is 12157105523. The reversal of 12157105511 is 11550175121.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 12157105511 - 2¹⁴ = 12157089127 is a prime.

It is a super-2 number, since 2×12157105511² (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 (12157105811) 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, 26486 + ... + 158163.

It is an arithmetic number, because the mean of its divisors is an integer number (3039339000).

Almost surely, 2^12157105511 is an apocalyptic number.

12157105511 is a deficient number, since it is larger than the sum of its proper divisors (250489).

12157105511 is an equidigital number, since it uses as much as digits as its factorization.

12157105511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250488.

The product of its (nonzero) digits is 1750, while the sum is 29.

It can be divided in two parts, 1215710 and 5511, that added together give a palindrome (1221221).

The spelling of 12157105511 in words is "twelve billion, one hundred fifty-seven million, one hundred five thousand, five hundred eleven".