12165421461660 has 72 divisors (see below), whose sum is σ = 36902449199616. Its totient is φ = 3244053421440.

The previous prime is 12165421461659. The next prime is 12165421461673. The reversal of 12165421461660 is 6616412456121.

12165421461660 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 5 + 4 + 21 + 4 + 616 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9805470 + ... + 10976250.

Almost surely, 2^{12165421461660} is an apocalyptic number.

12165421461660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12165421461660 is an abundant number, since it is smaller than the sum of its proper divisors (24737027737956).

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

12165421461660 is a wasteful number, since it uses less digits than its factorization.

12165421461660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1228523 (or 1228518 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 12165421461660 in words is "twelve trillion, one hundred sixty-five billion, four hundred twenty-one million, four hundred sixty-one thousand, six hundred sixty".