1660220065 has 16 divisors (see below), whose sum is σ = 2279416320. Its totient is φ = 1137165120.

The previous prime is 1660220047. The next prime is 1660220099. The reversal of 1660220065 is 5600220661.

It is not a de Polignac number, because 1660220065 - 2⁷ = 1660219937 is a prime.

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, 5851 + ... + 57919.

It is an arithmetic number, because the mean of its divisors is an integer number (142463520).

Almost surely, 2^1660220065 is an apocalyptic number.

It is an amenable number.

1660220065 is a deficient number, since it is larger than the sum of its proper divisors (619196255).

1660220065 is an equidigital number, since it uses as much as digits as its factorization.

1660220065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52992.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1660220065 is about 40745.7981269235. The cubic root of 1660220065 is about 1184.1004680333.

The spelling of 1660220065 in words is "one billion, six hundred sixty million, two hundred twenty thousand, sixty-five".