1668515136 has 56 divisors (see below), whose sum is σ = 4467843744. Its totient is φ = 549465600.

The previous prime is 1668515081. The next prime is 1668515141. The reversal of 1668515136 is 6315158661.

It is a super-2 number, since 2×1668515136² = 5567885518122196992, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36415 + ... + 68286.

It is an arithmetic number, because the mean of its divisors is an integer number (79782924).

Almost surely, 2^1668515136 is an apocalyptic number.

1668515136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1668515136 is an abundant number, since it is smaller than the sum of its proper divisors (2799328608).

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

1668515136 is a wasteful number, since it uses less digits than its factorization.

1668515136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104799 (or 104789 counting only the distinct ones).

The product of its digits is 129600, while the sum is 42.

The square root of 1668515136 is about 40847.4618060902. The cubic root of 1668515136 is about 1186.0692600984.

The spelling of 1668515136 in words is "one billion, six hundred sixty-eight million, five hundred fifteen thousand, one hundred thirty-six".