66801370 has 8 divisors (see below), whose sum is σ = 120242484. Its totient is φ = 26720544.

The previous prime is 66801349. The next prime is 66801377. The reversal of 66801370 is 7310866.

It can be written as a sum of positive squares in 2 ways, for example, as 65658609 + 1142761 = 8103^2 + 1069^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (66801377) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3340059 + ... + 3340078.

Almost surely, 2^66801370 is an apocalyptic number.

66801370 is a deficient number, since it is larger than the sum of its proper divisors (53441114).

66801370 is a wasteful number, since it uses less digits than its factorization.

66801370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6680144.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 66801370 is about 8173.2105075056. The cubic root of 66801370 is about 405.7530469362.

The spelling of 66801370 in words is "sixty-six million, eight hundred one thousand, three hundred seventy".