166402521456650 has 24 divisors (see below), whose sum is σ = 309571003375200. Its totient is φ = 66547607837360.

The previous prime is 166402521456637. The next prime is 166402521456659. The reversal of 166402521456650 is 56654125204661.

It is a junction number, because it is equal to n+sod(n) for n = 166402521456592 and 166402521456601.

It is not an unprimeable number, because it can be changed into a prime (166402521456659) 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 11 ways as a sum of consecutive naturals, for example, 334767800 + ... + 335264499.

It is an arithmetic number, because the mean of its divisors is an integer number (12898791807300).

Almost surely, 2^{166402521456650} is an apocalyptic number.

166402521456650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166402521456650 is a deficient number, since it is larger than the sum of its proper divisors (143168481918550).

166402521456650 is a wasteful number, since it uses less digits than its factorization.

166402521456650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670037278 (or 670037273 counting only the distinct ones).

The product of its (nonzero) digits is 10368000, while the sum is 53.

The spelling of 166402521456650 in words is "one hundred sixty-six trillion, four hundred two billion, five hundred twenty-one million, four hundred fifty-six thousand, six hundred fifty".