166939142550 has 48 divisors (see below), whose sum is σ = 422817795072. Its totient is φ = 43569930400.

The previous prime is 166939142549. The next prime is 166939142651. The reversal of 166939142550 is 55241939661.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 166939142493 and 166939142502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11832606 + ... + 11846705.

It is an arithmetic number, because the mean of its divisors is an integer number (8808704064).

Almost surely, 2^166939142550 is an apocalyptic number.

166939142550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166939142550 is an abundant number, since it is smaller than the sum of its proper divisors (255878652522).

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

166939142550 is a wasteful number, since it uses less digits than its factorization.

166939142550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23679373 (or 23679368 counting only the distinct ones).

The product of its (nonzero) digits is 1749600, while the sum is 51.

The spelling of 166939142550 in words is "one hundred sixty-six billion, nine hundred thirty-nine million, one hundred forty-two thousand, five hundred fifty".