166600550551 has 4 divisors (see below), whose sum is σ = 175369000600. Its totient is φ = 157832100504.

The previous prime is 166600550449. The next prime is 166600550561. The reversal of 166600550551 is 155055006661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166600550551 - 2¹³ = 166600542359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166600550561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4384224996 + ... + 4384225033.

It is an arithmetic number, because the mean of its divisors is an integer number (43842250150).

Almost surely, 2^166600550551 is an apocalyptic number.

166600550551 is a deficient number, since it is larger than the sum of its proper divisors (8768450049).

166600550551 is an equidigital number, since it uses as much as digits as its factorization.

166600550551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8768450048.

The product of its (nonzero) digits is 135000, while the sum is 40.

The spelling of 166600550551 in words is "one hundred sixty-six billion, six hundred million, five hundred fifty thousand, five hundred fifty-one".