66556654543350 has 72 divisors (see below), whose sum is σ = 178954919748072. Its totient is φ = 17734607510400.

The previous prime is 66556654543321. The next prime is 66556654543369. The reversal of 66556654543350 is 5334545665566.

It is a happy number.

66556654543350 is a `hidden beast` number, since 6 + 6 + 5 + 5 + 6 + 6 + 54 + 543 + 35 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 57062431 + ... + 58217130.

It is an arithmetic number, because the mean of its divisors is an integer number (2485484996501).

Almost surely, 2^{66556654543350} is an apocalyptic number.

66556654543350 is an abundant number, since it is smaller than the sum of its proper divisors (112398265204722).

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

66556654543350 is a wasteful number, since it uses less digits than its factorization.

66556654543350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115280862 (or 115280854 counting only the distinct ones).

The product of its (nonzero) digits is 583200000, while the sum is 63.

The spelling of 66556654543350 in words is "sixty-six trillion, five hundred fifty-six billion, six hundred fifty-four million, five hundred forty-three thousand, three hundred fifty".