1660161605 has 16 divisors (see below), whose sum is σ = 2112070464. Its totient is φ = 1248410880.

The previous prime is 1660161599. The next prime is 1660161623. The reversal of 1660161605 is 5061610661.

It is not a de Polignac number, because 1660161605 - 2¹⁰ = 1660160581 is a prime.

It is a super-2 number, since 2×1660161605² = 5512273109432352050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56894 + ... + 80976.

It is an arithmetic number, because the mean of its divisors is an integer number (132004404).

Almost surely, 2^1660161605 is an apocalyptic number.

It is an amenable number.

1660161605 is a deficient number, since it is larger than the sum of its proper divisors (451908859).

1660161605 is a wasteful number, since it uses less digits than its factorization.

1660161605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24916.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 1660161605 is about 40745.0807460238. The cubic root of 1660161605 is about 1184.0865696095.

The spelling of 1660161605 in words is "one billion, six hundred sixty million, one hundred sixty-one thousand, six hundred five".