66695080 has 32 divisors (see below), whose sum is σ = 158892840. Its totient is φ = 25108480.

The previous prime is 66695071. The next prime is 66695081. The reversal of 66695080 is 8059666.

It can be written as a sum of positive squares in 4 ways, for example, as 44435556 + 22259524 = 6666^2 + 4718^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (66695081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48361 + ... + 49720.

Almost surely, 2^66695080 is an apocalyptic number.

It is an amenable number.

66695080 is an abundant number, since it is smaller than the sum of its proper divisors (92197760).

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

66695080 is a wasteful number, since it uses less digits than its factorization.

66695080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98109 (or 98105 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 66695080 is about 8166.7055781386. The cubic root of 66695080 is about 405.5377300673.

The spelling of 66695080 in words is "sixty-six million, six hundred ninety-five thousand, eighty".