12155105616 has 40 divisors (see below), whose sum is σ = 32249361504. Its totient is φ = 3942195840.

The previous prime is 12155105609. The next prime is 12155105623. The reversal of 12155105616 is 61650155121.

It is an interprime number because it is at equal distance from previous prime (12155105609) and next prime (12155105623).

It is a super-2 number, since 2×12155105616² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3420270 + ... + 3423821.

Almost surely, 2^12155105616 is an apocalyptic number.

12155105616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12155105616 is an abundant number, since it is smaller than the sum of its proper divisors (20094255888).

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

12155105616 is a wasteful number, since it uses less digits than its factorization.

12155105616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6844139 (or 6844133 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 33.

The spelling of 12155105616 in words is "twelve billion, one hundred fifty-five million, one hundred five thousand, six hundred sixteen".