1666160051 has 4 divisors (see below), whose sum is σ = 1666748952. Its totient is φ = 1665571152.

The previous prime is 1666160047. The next prime is 1666160063. The reversal of 1666160051 is 1500616661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1500616661 = 761 ⋅1971901.

It is a cyclic number.

It is not a de Polignac number, because 1666160051 - 2² = 1666160047 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666160081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 290186 + ... + 295871.

It is an arithmetic number, because the mean of its divisors is an integer number (416687238).

Almost surely, 2^1666160051 is an apocalyptic number.

1666160051 is a deficient number, since it is larger than the sum of its proper divisors (588901).

1666160051 is an equidigital number, since it uses as much as digits as its factorization.

1666160051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588900.

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

The square root of 1666160051 is about 40818.6238254060. The cubic root of 1666160051 is about 1185.5109574643.

The spelling of 1666160051 in words is "one billion, six hundred sixty-six million, one hundred sixty thousand, fifty-one".