66395970 has 32 divisors (see below), whose sum is σ = 177056640. Its totient is φ = 17705520.

The previous prime is 66395969. The next prime is 66395971. The reversal of 66395970 is 7959366.

66395970 is a `hidden beast` number, since 6 + 639 + 5 + 9 + 7 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (66395969) and next prime (66395971).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (66395971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122686 + ... + 123225.

It is an arithmetic number, because the mean of its divisors is an integer number (5533020).

Almost surely, 2^66395970 is an apocalyptic number.

66395970 is an abundant number, since it is smaller than the sum of its proper divisors (110660670).

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

66395970 is a wasteful number, since it uses less digits than its factorization.

66395970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245927 (or 245921 counting only the distinct ones).

The product of its (nonzero) digits is 306180, while the sum is 45.

The square root of 66395970 is about 8148.3722300837. The cubic root of 66395970 is about 404.9305779500.

The spelling of 66395970 in words is "sixty-six million, three hundred ninety-five thousand, nine hundred seventy".