166572361 has 4 divisors (see below), whose sum is σ = 166609872. Its totient is φ = 166534852.

The previous prime is 166572347. The next prime is 166572397. The reversal of 166572361 is 163275661.

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, and also an emirpimes, since its reverse is a distinct semiprime: 163275661 = 751 ⋅217411.

It is a cyclic number.

It is not a de Polignac number, because 166572361 - 2¹³ = 166564169 is a prime.

It is a super-2 number, since 2×166572361² = 55492702898228642, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166572361.

It is not an unprimeable number, because it can be changed into a prime (166572061) 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, 11035 + ... + 21328.

It is an arithmetic number, because the mean of its divisors is an integer number (41652468).

Almost surely, 2^166572361 is an apocalyptic number.

It is an amenable number.

166572361 is a deficient number, since it is larger than the sum of its proper divisors (37511).

166572361 is an equidigital number, since it uses as much as digits as its factorization.

166572361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37510.

The product of its digits is 45360, while the sum is 37.

The square root of 166572361 is about 12906.2915277782. The cubic root of 166572361 is about 550.2173917489.

The spelling of 166572361 in words is "one hundred sixty-six million, five hundred seventy-two thousand, three hundred sixty-one".