1668513111 has 8 divisors (see below), whose sum is σ = 2225086080. Its totient is φ = 1112141112.

The previous prime is 1668513109. The next prime is 1668513137. The reversal of 1668513111 is 1113158661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1668513111 - 2¹ = 1668513109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668513211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29665 + ... + 64938.

It is an arithmetic number, because the mean of its divisors is an integer number (278135760).

Almost surely, 2^1668513111 is an apocalyptic number.

1668513111 is a deficient number, since it is larger than the sum of its proper divisors (556572969).

1668513111 is an equidigital number, since it uses as much as digits as its factorization.

1668513111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100485.

The product of its digits is 4320, while the sum is 33.

The square root of 1668513111 is about 40847.4370187408. The cubic root of 1668513111 is about 1186.0687802723.

The spelling of 1668513111 in words is "one billion, six hundred sixty-eight million, five hundred thirteen thousand, one hundred eleven".