12051555440 has 20 divisors (see below), whose sum is σ = 28019866584. Its totient is φ = 4820622144.

The previous prime is 12051555437. The next prime is 12051555469. The reversal of 12051555440 is 4455515021.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 12051555397 and 12051555406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75322142 + ... + 75322301.

Almost surely, 2^12051555440 is an apocalyptic number.

12051555440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12051555440 is an abundant number, since it is smaller than the sum of its proper divisors (15968311144).

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

12051555440 is a wasteful number, since it uses less digits than its factorization.

12051555440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150644456 (or 150644450 counting only the distinct ones).

The product of its (nonzero) digits is 20000, while the sum is 32.

The spelling of 12051555440 in words is "twelve billion, fifty-one million, five hundred fifty-five thousand, four hundred forty".