1516831668 has 144 divisors (see below), whose sum is σ = 4282177536. Its totient is φ = 448865280.

The previous prime is 1516831637. The next prime is 1516831697. The reversal of 1516831668 is 8661386151.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3960205 + ... + 3960587.

It is an arithmetic number, because the mean of its divisors is an integer number (29737344).

Almost surely, 2^1516831668 is an apocalyptic number.

1516831668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1516831668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2141088768).

1516831668 is an abundant number, since it is smaller than the sum of its proper divisors (2765345868).

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

1516831668 is a wasteful number, since it uses less digits than its factorization.

1516831668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614 (or 609 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 1516831668 is about 38946.5231824357. The cubic root of 1516831668 is about 1148.9799822448.

It can be divided in two parts, 151683 and 1668, that added together give a palindrome (153351).

The spelling of 1516831668 in words is "one billion, five hundred sixteen million, eight hundred thirty-one thousand, six hundred sixty-eight".