66771120 has 80 divisors (see below), whose sum is σ = 222923232. Its totient is φ = 16435200.

The previous prime is 66771091. The next prime is 66771167. The reversal of 66771120 is 2117766.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7581 + ... + 13820.

Almost surely, 2^66771120 is an apocalyptic number.

66771120 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66771120 is an abundant number, since it is smaller than the sum of its proper divisors (156152112).

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

66771120 is a wasteful number, since it uses less digits than its factorization.

66771120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21430 (or 21424 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 66771120 is about 8171.3597399698. The cubic root of 66771120 is about 405.6917912921.

Adding to 66771120 its reverse (2117766), we get a palindrome (68888886).

The spelling of 66771120 in words is "sixty-six million, seven hundred seventy-one thousand, one hundred twenty".