66111555655210 has 64 divisors (see below), whose sum is σ = 133728450363648. Its totient is φ = 23348783867904.

The previous prime is 66111555655207. The next prime is 66111555655237. The reversal of 66111555655210 is 1255655511166.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 443171994 + ... + 443321146.

It is an arithmetic number, because the mean of its divisors is an integer number (2089507036932).

Almost surely, 2^{66111555655210} is an apocalyptic number.

66111555655210 is an abundant number, since it is smaller than the sum of its proper divisors (67616894708438).

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

66111555655210 is a wasteful number, since it uses less digits than its factorization.

66111555655210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297439.

The product of its (nonzero) digits is 1350000, while the sum is 49.

The spelling of 66111555655210 in words is "sixty-six trillion, one hundred eleven billion, five hundred fifty-five million, six hundred fifty-five thousand, two hundred ten".