445171661 has 4 divisors (see below), whose sum is σ = 485641824. Its totient is φ = 404701500.

The previous prime is 445171637. The next prime is 445171723. The reversal of 445171661 is 166171544.

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.

It is a cyclic number.

It is not a de Polignac number, because 445171661 - 2¹⁰ = 445170637 is a prime.

It is a super-3 number, since 3×445171661³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445171631) 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, 20235065 + ... + 20235086.

It is an arithmetic number, because the mean of its divisors is an integer number (121410456).

Almost surely, 2^445171661 is an apocalyptic number.

It is an amenable number.

445171661 is a deficient number, since it is larger than the sum of its proper divisors (40470163).

445171661 is a wasteful number, since it uses less digits than its factorization.

445171661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40470162.

The product of its digits is 20160, while the sum is 35.

The square root of 445171661 is about 21099.0914733313. The cubic root of 445171661 is about 763.5588291336.

The spelling of 445171661 in words is "four hundred forty-five million, one hundred seventy-one thousand, six hundred sixty-one".