166872121582 has 8 divisors (see below), whose sum is σ = 261191146896. Its totient is φ = 79808405952.

The previous prime is 166872121511. The next prime is 166872121583. The reversal of 166872121582 is 285121278661.

166872121582 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 super-2 number, since 2×166872121582² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166872121583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1813827363 + ... + 1813827454.

It is an arithmetic number, because the mean of its divisors is an integer number (32648893362).

Almost surely, 2^166872121582 is an apocalyptic number.

166872121582 is a deficient number, since it is larger than the sum of its proper divisors (94319025314).

166872121582 is a wasteful number, since it uses less digits than its factorization.

166872121582 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3627654842.

The product of its digits is 645120, while the sum is 49.

The spelling of 166872121582 in words is "one hundred sixty-six billion, eight hundred seventy-two million, one hundred twenty-one thousand, five hundred eighty-two".