545171661 has 16 divisors (see below), whose sum is σ = 808062400. Its totient is φ = 363267504.

The previous prime is 545171633. The next prime is 545171677. The reversal of 545171661 is 166171545.

It is a happy number.

545171661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 545171661 - 2⁷ = 545171533 is a prime.

It is a super-3 number, since 3×545171661³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545175661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71910 + ... + 79128.

It is an arithmetic number, because the mean of its divisors is an integer number (50503900).

Almost surely, 2^545171661 is an apocalyptic number.

It is an amenable number.

545171661 is a deficient number, since it is larger than the sum of its proper divisors (262890739).

545171661 is a wasteful number, since it uses less digits than its factorization.

545171661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10025 (or 10019 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 545171661 is about 23348.9113450713. The cubic root of 545171661 is about 816.9166682799.

It can be divided in two parts, 54 and 5171661, that added together give a palindrome (5171715).

The spelling of 545171661 in words is "five hundred forty-five million, one hundred seventy-one thousand, six hundred sixty-one".