67166238061 has 4 divisors (see below), whose sum is σ = 72332871772. Its totient is φ = 61999604352.

The previous prime is 67166238049. The next prime is 67166238103. The reversal of 67166238061 is 16083266176.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15056762436 + 52109475625 = 122706^2 + 228275^2 .

It is a cyclic number.

It is not a de Polignac number, because 67166238061 - 2⁹ = 67166237549 is a prime.

It is a super-2 number, since 2×67166238061² (a number of 22 digits) contains 22 as substring.

It is the 259165-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67166238001) by changing a digit.

It is a nontrivial repunit in base 259164.

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 3 ways as a sum of consecutive naturals, for example, 2583316836 + ... + 2583316861.

It is an arithmetic number, because the mean of its divisors is an integer number (18083217943).

Almost surely, 2^67166238061 is an apocalyptic number.

It is an amenable number.

67166238061 is a deficient number, since it is larger than the sum of its proper divisors (5166633711).

67166238061 is a wasteful number, since it uses less digits than its factorization.

67166238061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5166633710.

The product of its (nonzero) digits is 435456, while the sum is 46.

The spelling of 67166238061 in words is "sixty-seven billion, one hundred sixty-six million, two hundred thirty-eight thousand, sixty-one".