166211572 has 6 divisors (see below), whose sum is σ = 290870258. Its totient is φ = 83105784.

The previous prime is 166211527. The next prime is 166211597. The reversal of 166211572 is 275112661.

166211572 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 154405476 + 11806096 = 12426^2 + 3436^2 .

It is a super-2 number, since 2×166211572² = 55252573333422368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20776443 + ... + 20776450.

Almost surely, 2^166211572 is an apocalyptic number.

It is an amenable number.

166211572 is a deficient number, since it is larger than the sum of its proper divisors (124658686).

166211572 is a wasteful number, since it uses less digits than its factorization.

166211572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41552897 (or 41552895 counting only the distinct ones).

The product of its digits is 5040, while the sum is 31.

The square root of 166211572 is about 12892.3066981824. The cubic root of 166211572 is about 549.8198550520.

The spelling of 166211572 in words is "one hundred sixty-six million, two hundred eleven thousand, five hundred seventy-two".