66161474540671 has 8 divisors (see below), whose sum is σ = 66180869233920. Its totient is φ = 66142080531672.

The previous prime is 66161474540669. The next prime is 66161474540687. The reversal of 66161474540671 is 17604547416166.

66161474540671 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66161474540671 - 2¹ = 66161474540669 is a prime.

It is a super-4 number, since 4×66161474540671⁴ (a number of 56 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66161474540611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243446100 + ... + 243717718.

It is an arithmetic number, because the mean of its divisors is an integer number (8272608654240).

Almost surely, 2^{66161474540671} is an apocalyptic number.

66161474540671 is a deficient number, since it is larger than the sum of its proper divisors (19394693249).

66161474540671 is a wasteful number, since it uses less digits than its factorization.

66161474540671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342125.

The product of its (nonzero) digits is 20321280, while the sum is 58.

The spelling of 66161474540671 in words is "sixty-six trillion, one hundred sixty-one billion, four hundred seventy-four million, five hundred forty thousand, six hundred seventy-one".