66101561155 has 16 divisors (see below), whose sum is σ = 92006611200. Its totient is φ = 44650264032.

The previous prime is 66101561147. The next prime is 66101561171. The reversal of 66101561155 is 55116510166.

It is a cyclic number.

It is not a de Polignac number, because 66101561155 - 2³ = 66101561147 is a prime.

It is a super-3 number, since 3×66101561155³ (a number of 33 digits) contains 333 as substring.

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, 14091805 + ... + 14096494.

It is an arithmetic number, because the mean of its divisors is an integer number (5750413200).

Almost surely, 2^66101561155 is an apocalyptic number.

66101561155 is a deficient number, since it is larger than the sum of its proper divisors (25905050045).

66101561155 is a wasteful number, since it uses less digits than its factorization.

66101561155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28188378.

The product of its (nonzero) digits is 27000, while the sum is 37.

The spelling of 66101561155 in words is "sixty-six billion, one hundred one million, five hundred sixty-one thousand, one hundred fifty-five".