66101116610555 has 16 divisors (see below), whose sum is σ = 87506468822304. Its totient is φ = 47622568062720.

The previous prime is 66101116610539. The next prime is 66101116610561. The reversal of 66101116610555 is 55501661110166.

It is not a de Polignac number, because 66101116610555 - 2⁴ = 66101116610539 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12401707769 + ... + 12401713098.

It is an arithmetic number, because the mean of its divisors is an integer number (5469154301394).

Almost surely, 2^{66101116610555} is an apocalyptic number.

66101116610555 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66101116610555 is a deficient number, since it is larger than the sum of its proper divisors (21405352211749).

66101116610555 is a wasteful number, since it uses less digits than its factorization.

66101116610555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24803420926.

The product of its (nonzero) digits is 162000, while the sum is 44.

The spelling of 66101116610555 in words is "sixty-six trillion, one hundred one billion, one hundred sixteen million, six hundred ten thousand, five hundred fifty-five".