66557016 has 24 divisors (see below), whose sum is σ = 180258780. Its totient is φ = 22185648.

The previous prime is 66557011. The next prime is 66557021. The reversal of 66557016 is 61075566.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66557011) and next prime (66557021).

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66557011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 462130 + ... + 462273.

Almost surely, 2^66557016 is an apocalyptic number.

It is an amenable number.

66557016 is an abundant number, since it is smaller than the sum of its proper divisors (113701764).

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

66557016 is a wasteful number, since it uses less digits than its factorization.

66557016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924415 (or 924408 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 66557016 is about 8158.2483414027. The cubic root of 66557016 is about 405.2577052123.

The spelling of 66557016 in words is "sixty-six million, five hundred fifty-seven thousand, sixteen".