166164006500 has 24 divisors (see below), whose sum is σ = 362902191288. Its totient is φ = 66465602400.

The previous prime is 166164006497. The next prime is 166164006509. The reversal of 166164006500 is 5600461661.

It can be written as a sum of positive squares in 4 ways, for example, as 38909140516 + 127254865984 = 197254^2 + 356728^2 .

It is a super-2 number, since 2×166164006500² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166164006509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166163507 + ... + 166164506.

It is an arithmetic number, because the mean of its divisors is an integer number (15120924637).

Almost surely, 2^166164006500 is an apocalyptic number.

166164006500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166164006500 is an abundant number, since it is smaller than the sum of its proper divisors (196738184788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166164006500 is a wasteful number, since it uses less digits than its factorization.

166164006500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332328032 (or 332328020 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 166164006500 in words is "one hundred sixty-six billion, one hundred sixty-four million, six thousand, five hundred".