66001006161 has 12 divisors (see below), whose sum is σ = 95339855988. Its totient is φ = 43998331104.

The previous prime is 66001006157. The next prime is 66001006189. The reversal of 66001006161 is 16160010066.

It can be written as a sum of positive squares in 2 ways, for example, as 10851180561 + 55149825600 = 104169^2 + 234840^2 .

It is not a de Polignac number, because 66001006161 - 2² = 66001006157 is a prime.

It is a super-2 number, since 2×66001006161² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66001006111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6750 + ... + 363383.

It is an arithmetic number, because the mean of its divisors is an integer number (7944987999).

Almost surely, 2^66001006161 is an apocalyptic number.

It is an amenable number.

66001006161 is a deficient number, since it is larger than the sum of its proper divisors (29338849827).

66001006161 is a wasteful number, since it uses less digits than its factorization.

66001006161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389952 (or 389949 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The spelling of 66001006161 in words is "sixty-six billion, one million, six thousand, one hundred sixty-one".