166155507 has 24 divisors (see below), whose sum is σ = 274669824. Its totient is φ = 94814064.

The previous prime is 166155503. The next prime is 166155541. The reversal of 166155507 is 705551661.

It is not a de Polignac number, because 166155507 - 2² = 166155503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166155503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60588 + ... + 63270.

It is an arithmetic number, because the mean of its divisors is an integer number (11444576).

Almost surely, 2^166155507 is an apocalyptic number.

166155507 is a deficient number, since it is larger than the sum of its proper divisors (108514317).

166155507 is a wasteful number, since it uses less digits than its factorization.

166155507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3679 (or 3676 counting only the distinct ones).

The product of its (nonzero) digits is 31500, while the sum is 36.

The square root of 166155507 is about 12890.1321560332. The cubic root of 166155507 is about 549.7580279955.

It can be divided in two parts, 16615 and 5507, that added together give a palindrome (22122).

The spelling of 166155507 in words is "one hundred sixty-six million, one hundred fifty-five thousand, five hundred seven".