166361642 has 4 divisors (see below), whose sum is σ = 249542466. Its totient is φ = 83180820.

The previous prime is 166361639. The next prime is 166361687. The reversal of 166361642 is 246163661.

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

It can be written as a sum of positive squares in only one way, i.e., 126810121 + 39551521 = 11261^2 + 6289^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41590409 + ... + 41590412.

Almost surely, 2^166361642 is an apocalyptic number.

166361642 is a deficient number, since it is larger than the sum of its proper divisors (83180824).

166361642 is an equidigital number, since it uses as much as digits as its factorization.

166361642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83180823.

The product of its digits is 31104, while the sum is 35.

The square root of 166361642 is about 12898.1255227262. The cubic root of 166361642 is about 549.9852800468.

The spelling of 166361642 in words is "one hundred sixty-six million, three hundred sixty-one thousand, six hundred forty-two".