190018661 has 4 divisors (see below), whose sum is σ = 217164192. Its totient is φ = 162873132.

The previous prime is 190018637. The next prime is 190018667. The reversal of 190018661 is 166810091.

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: 166810091 = 7 ⋅23830013.

It is a cyclic number.

It is not a de Polignac number, because 190018661 - 2⁶ = 190018597 is a prime.

It is a super-2 number, since 2×190018661² = 72214183056465842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190018667) 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, 13572755 + ... + 13572768.

It is an arithmetic number, because the mean of its divisors is an integer number (54291048).

Almost surely, 2^190018661 is an apocalyptic number.

It is an amenable number.

190018661 is a deficient number, since it is larger than the sum of its proper divisors (27145531).

190018661 is an equidigital number, since it uses as much as digits as its factorization.

190018661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27145530.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 190018661 is about 13784.7256410855. The cubic root of 190018661 is about 574.9085283605.

The spelling of 190018661 in words is "one hundred ninety million, eighteen thousand, six hundred sixty-one".