166111156606550 has 96 divisors (see below), whose sum is σ = 317524136529600. Its totient is φ = 64614939494400.

The previous prime is 166111156606541. The next prime is 166111156606579. The reversal of 166111156606550 is 55606651111661.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 855488876 + ... + 855683024.

It is an arithmetic number, because the mean of its divisors is an integer number (3307543088850).

Almost surely, 2^{166111156606550} is an apocalyptic number.

166111156606550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166111156606550 is a deficient number, since it is larger than the sum of its proper divisors (151412979923050).

166111156606550 is a wasteful number, since it uses less digits than its factorization.

166111156606550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195546 (or 195541 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 50.

The spelling of 166111156606550 in words is "one hundred sixty-six trillion, one hundred eleven billion, one hundred fifty-six million, six hundred six thousand, five hundred fifty".