12155611026 has 64 divisors (see below), whose sum is σ = 26602168320. Its totient is φ = 3680389440.

The previous prime is 12155611001. The next prime is 12155611049. The reversal of 12155611026 is 62011655121.

It is a junction number, because it is equal to n+sod(n) for n = 12155610984 and 12155611002.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1913211 + ... + 1919553.

It is an arithmetic number, because the mean of its divisors is an integer number (415658880).

Almost surely, 2^12155611026 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12155611026, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13301084160).

12155611026 is an abundant number, since it is smaller than the sum of its proper divisors (14446557294).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12155611026 is a wasteful number, since it uses less digits than its factorization.

12155611026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6751.

The product of its (nonzero) digits is 3600, while the sum is 30.

The spelling of 12155611026 in words is "twelve billion, one hundred fifty-five million, six hundred eleven thousand, twenty-six".