1660665066 has 16 divisors (see below), whose sum is σ = 3402338688. Its totient is φ = 540053600.

The previous prime is 1660665029. The next prime is 1660665073. The reversal of 1660665066 is 6605660661.

It is a super-2 number, since 2×1660665066² = 5515616922865568712, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3375090 + ... + 3375581.

It is an arithmetic number, because the mean of its divisors is an integer number (212646168).

Almost surely, 2^1660665066 is an apocalyptic number.

1660665066 is an abundant number, since it is smaller than the sum of its proper divisors (1741673622).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1660665066 is a wasteful number, since it uses less digits than its factorization.

1660665066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6750717.

The product of its (nonzero) digits is 233280, while the sum is 42.

The square root of 1660665066 is about 40751.2584590955. The cubic root of 1660665066 is about 1184.2062529694.

The spelling of 1660665066 in words is "one billion, six hundred sixty million, six hundred sixty-five thousand, sixty-six".