166001641 has 4 divisors (see below), whose sum is σ = 178771012. Its totient is φ = 153232272.

The previous prime is 166001639. The next prime is 166001653. The reversal of 166001641 is 146100661.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12960000 + 153041641 = 3600^2 + 12371^2 .

It is a cyclic number.

It is not a de Polignac number, because 166001641 - 2¹ = 166001639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166101641) 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, 6384666 + ... + 6384691.

It is an arithmetic number, because the mean of its divisors is an integer number (44692753).

Almost surely, 2^166001641 is an apocalyptic number.

It is an amenable number.

166001641 is a deficient number, since it is larger than the sum of its proper divisors (12769371).

166001641 is a wasteful number, since it uses less digits than its factorization.

166001641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12769370.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 166001641 is about 12884.1624097184. The cubic root of 166001641 is about 549.5882769903.

The spelling of 166001641 in words is "one hundred sixty-six million, one thousand, six hundred forty-one".