66115020 has 24 divisors (see below), whose sum is σ = 185122224. Its totient is φ = 17630656.

The previous prime is 66115013. The next prime is 66115039. The reversal of 66115020 is 2051166.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 550899 + ... + 551018.

It is an arithmetic number, because the mean of its divisors is an integer number (7713426).

Almost surely, 2^66115020 is an apocalyptic number.

66115020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66115020 is an abundant number, since it is smaller than the sum of its proper divisors (119007204).

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

66115020 is a wasteful number, since it uses less digits than its factorization.

66115020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101929 (or 1101927 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 66115020 is about 8131.1143147788. The cubic root of 66115020 is about 404.3586251269.

Adding to 66115020 its reverse (2051166), we get a palindrome (68166186).

The spelling of 66115020 in words is "sixty-six million, one hundred fifteen thousand, twenty".