661037171 has 4 divisors (see below), whose sum is σ = 661318344. Its totient is φ = 660756000.

The previous prime is 661037131. The next prime is 661037173. The reversal of 661037171 is 171730166.

661037171 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 171730166 = 2 ⋅85865083.

It is a cyclic number.

It is not a de Polignac number, because 661037171 - 2¹⁰ = 661036147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661037173) 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, 137030 + ... + 141771.

It is an arithmetic number, because the mean of its divisors is an integer number (165329586).

Almost surely, 2^661037171 is an apocalyptic number.

661037171 is a deficient number, since it is larger than the sum of its proper divisors (281173).

661037171 is a wasteful number, since it uses less digits than its factorization.

661037171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281172.

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 661037171 is about 25710.6431463703. The cubic root of 661037171 is about 871.1146021549.

The spelling of 661037171 in words is "six hundred sixty-one million, thirty-seven thousand, one hundred seventy-one".