66610516 has 24 divisors (see below), whose sum is σ = 133491456. Its totient is φ = 28489440.

The previous prime is 66610493. The next prime is 66610519. The reversal of 66610516 is 61501666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66610519) 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, 13461 + ... + 17731.

It is an arithmetic number, because the mean of its divisors is an integer number (5562144).

Almost surely, 2^66610516 is an apocalyptic number.

It is an amenable number.

66610516 is an abundant number, since it is smaller than the sum of its proper divisors (66880940).

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

66610516 is a wasteful number, since it uses less digits than its factorization.

66610516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4839 (or 4837 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 66610516 is about 8161.5265728906. The cubic root of 66610516 is about 405.3662611634.

The spelling of 66610516 in words is "sixty-six million, six hundred ten thousand, five hundred sixteen".