166681984850 has 24 divisors (see below), whose sum is σ = 320719132260. Its totient is φ = 64373731520.

The previous prime is 166681984849. The next prime is 166681984871. The reversal of 166681984850 is 58489186661.

It can be written as a sum of positive squares in 6 ways, for example, as 103774823881 + 62907160969 = 322141^2 + 250813^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57475097 + ... + 57477996.

Almost surely, 2^166681984850 is an apocalyptic number.

166681984850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166681984850 is a deficient number, since it is larger than the sum of its proper divisors (154037147410).

166681984850 is a wasteful number, since it uses less digits than its factorization.

166681984850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114953134 (or 114953129 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 62.

The spelling of 166681984850 in words is "one hundred sixty-six billion, six hundred eighty-one million, nine hundred eighty-four thousand, eight hundred fifty".