66164204155 has 16 divisors (see below), whose sum is σ = 91139224320. Its totient is φ = 45169867872.

The previous prime is 66164204101. The next prime is 66164204201. The reversal of 66164204155 is 55140246166.

It is a cyclic number.

It is not a de Polignac number, because 66164204155 - 2⁷ = 66164204027 is a prime.

It is a super-2 number, since 2×66164204155² (a number of 22 digits) contains 22 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, 4155945 + ... + 4171834.

It is an arithmetic number, because the mean of its divisors is an integer number (5696201520).

Almost surely, 2^66164204155 is an apocalyptic number.

66164204155 is a deficient number, since it is larger than the sum of its proper divisors (24975020165).

66164204155 is a wasteful number, since it uses less digits than its factorization.

66164204155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8328018.

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 66164204155 in words is "sixty-six billion, one hundred sixty-four million, two hundred four thousand, one hundred fifty-five".