661005516170 has 8 divisors (see below), whose sum is σ = 1189809929124. Its totient is φ = 264402206464.

The previous prime is 661005516161. The next prime is 661005516179. The reversal of 661005516170 is 71615500166.

It is an interprime number because it is at equal distance from previous prime (661005516161) and next prime (661005516179).

It can be written as a sum of positive squares in 2 ways, for example, as 581532831889 + 79472684281 = 762583^2 + 281909^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (661005516179) 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, 33050275799 + ... + 33050275818.

Almost surely, 2^661005516170 is an apocalyptic number.

661005516170 is a deficient number, since it is larger than the sum of its proper divisors (528804412954).

661005516170 is a wasteful number, since it uses less digits than its factorization.

661005516170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66100551624.

The product of its (nonzero) digits is 37800, while the sum is 38.

The spelling of 661005516170 in words is "six hundred sixty-one billion, five million, five hundred sixteen thousand, one hundred seventy".