661016169 has 24 divisors (see below), whose sum is σ = 1077523200. Its totient is φ = 386799840.

The previous prime is 661016141. The next prime is 661016173. The reversal of 661016169 is 961610166.

It is not a de Polignac number, because 661016169 - 2¹² = 661012073 is a prime.

It is a super-2 number, since 2×661016169² = 873884751358873122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (661016119) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 112249 + ... + 117990.

It is an arithmetic number, because the mean of its divisors is an integer number (44896800).

Almost surely, 2^661016169 is an apocalyptic number.

It is an amenable number.

661016169 is a deficient number, since it is larger than the sum of its proper divisors (416507031).

661016169 is a wasteful number, since it uses less digits than its factorization.

661016169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230285 (or 230282 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 661016169 is about 25710.2347130476. The cubic root of 661016169 is about 871.1053765806.

The spelling of 661016169 in words is "six hundred sixty-one million, sixteen thousand, one hundred sixty-nine".