66105523047078 has 48 divisors (see below), whose sum is σ = 144022478522832. Its totient is φ = 21913048584000.

The previous prime is 66105523047077. The next prime is 66105523047101. The reversal of 66105523047078 is 87074032550166.

66105523047078 is a `hidden beast` number, since 6 + 6 + 1 + 0 + 5 + 523 + 0 + 47 + 0 + 78 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66105523047077) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 232025973 + ... + 232310703.

It is an arithmetic number, because the mean of its divisors is an integer number (3000468302559).

Almost surely, 2^{66105523047078} is an apocalyptic number.

66105523047078 is an abundant number, since it is smaller than the sum of its proper divisors (77916955475754).

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

66105523047078 is a wasteful number, since it uses less digits than its factorization.

66105523047078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356181 (or 356178 counting only the distinct ones).

The product of its (nonzero) digits is 8467200, while the sum is 54.

The spelling of 66105523047078 in words is "sixty-six trillion, one hundred five billion, five hundred twenty-three million, forty-seven thousand, seventy-eight".