661740171 has 8 divisors (see below), whose sum is σ = 882485904. Its totient is φ = 441077280.

The previous prime is 661740169. The next prime is 661740179. The reversal of 661740171 is 171047166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 661740171 - 2¹ = 661740169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661740179) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1261 + ... + 36401.

It is an arithmetic number, because the mean of its divisors is an integer number (110310738).

Almost surely, 2^661740171 is an apocalyptic number.

661740171 is a deficient number, since it is larger than the sum of its proper divisors (220745733).

661740171 is a wasteful number, since it uses less digits than its factorization.

661740171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41421.

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 661740171 is about 25724.3108945604. The cubic root of 661740171 is about 871.4232971527.

The spelling of 661740171 in words is "six hundred sixty-one million, seven hundred forty thousand, one hundred seventy-one".