12155027640 has 64 divisors (see below), whose sum is σ = 41674383360. Its totient is φ = 2778291840.

The previous prime is 12155027617. The next prime is 12155027653. The reversal of 12155027640 is 4672055121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7234296 + ... + 7235975.

It is an arithmetic number, because the mean of its divisors is an integer number (651162240).

Almost surely, 2^12155027640 is an apocalyptic number.

12155027640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12155027640 is an abundant number, since it is smaller than the sum of its proper divisors (29519355720).

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

12155027640 is a wasteful number, since it uses less digits than its factorization.

12155027640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14470292 (or 14470288 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 33.

The spelling of 12155027640 in words is "twelve billion, one hundred fifty-five million, twenty-seven thousand, six hundred forty".