1660213055 has 4 divisors (see below), whose sum is σ = 1992255672. Its totient is φ = 1328170440.

The previous prime is 1660213043. The next prime is 1660213057. The reversal of 1660213055 is 5503120661.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1660213055 - 2⁴ = 1660213039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660213057) 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, 166021301 + ... + 166021310.

It is an arithmetic number, because the mean of its divisors is an integer number (498063918).

Almost surely, 2^1660213055 is an apocalyptic number.

1660213055 is a deficient number, since it is larger than the sum of its proper divisors (332042617).

1660213055 is an equidigital number, since it uses as much as digits as its factorization.

1660213055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332042616.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 1660213055 is about 40745.7121056928. The cubic root of 1660213055 is about 1184.0988014759.

The spelling of 1660213055 in words is "one billion, six hundred sixty million, two hundred thirteen thousand, fifty-five".