1660166015 has 4 divisors (see below), whose sum is σ = 1992199224. Its totient is φ = 1328132808.

The previous prime is 1660165993. The next prime is 1660166063. The reversal of 1660166015 is 5106610661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5106610661 = 4297 ⋅1188413.

It is a cyclic number.

It is not a de Polignac number, because 1660166015 - 2⁶ = 1660165951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166016597 + ... + 166016606.

It is an arithmetic number, because the mean of its divisors is an integer number (498049806).

Almost surely, 2^1660166015 is an apocalyptic number.

1660166015 is a deficient number, since it is larger than the sum of its proper divisors (332033209).

1660166015 is an equidigital number, since it uses as much as digits as its factorization.

1660166015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332033208.

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

The square root of 1660166015 is about 40745.1348629502. The cubic root of 1660166015 is about 1184.0876180651.

Adding to 1660166015 its reverse (5106610661), we get a palindrome (6766776676).

The spelling of 1660166015 in words is "one billion, six hundred sixty million, one hundred sixty-six thousand, fifteen".