1666201518 has 24 divisors (see below), whose sum is σ = 3822463008. Its totient is φ = 522729792.

The previous prime is 1666201499. The next prime is 1666201529. The reversal of 1666201518 is 8151026661.

1666201518 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×1666201518³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2722246 + ... + 2722857.

It is an arithmetic number, because the mean of its divisors is an integer number (159269292).

Almost surely, 2^1666201518 is an apocalyptic number.

1666201518 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1666201518 is an abundant number, since it is smaller than the sum of its proper divisors (2156261490).

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

1666201518 is a wasteful number, since it uses less digits than its factorization.

1666201518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5445128 (or 5445125 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 1666201518 is about 40819.1317644067. The cubic root of 1666201518 is about 1185.5207922888.

The spelling of 1666201518 in words is "one billion, six hundred sixty-six million, two hundred one thousand, five hundred eighteen".