166751601 has 4 divisors (see below), whose sum is σ = 222335472. Its totient is φ = 111167732.

The previous prime is 166751593. The next prime is 166751609. The reversal of 166751601 is 106157661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (166751593) and next prime (166751609).

It is a cyclic number.

It is not a de Polignac number, because 166751601 - 2³ = 166751593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166751609) 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, 27791931 + ... + 27791936.

It is an arithmetic number, because the mean of its divisors is an integer number (55583868).

Almost surely, 2^166751601 is an apocalyptic number.

It is an amenable number.

166751601 is a deficient number, since it is larger than the sum of its proper divisors (55583871).

166751601 is an equidigital number, since it uses as much as digits as its factorization.

166751601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55583870.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 166751601 is about 12913.2335609637. The cubic root of 166751601 is about 550.4146746037.

The spelling of 166751601 in words is "one hundred sixty-six million, seven hundred fifty-one thousand, six hundred one".