66920170 has 8 divisors (see below), whose sum is σ = 120456324. Its totient is φ = 26768064.

The previous prime is 66920149. The next prime is 66920201. The reversal of 66920170 is 7102966.

It can be written as a sum of positive squares in 2 ways, for example, as 64979721 + 1940449 = 8061^2 + 1393^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3345999 + ... + 3346018.

Almost surely, 2^66920170 is an apocalyptic number.

66920170 is a deficient number, since it is larger than the sum of its proper divisors (53536154).

66920170 is a wasteful number, since it uses less digits than its factorization.

66920170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6692024.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 66920170 is about 8180.4749250884. The cubic root of 66920170 is about 405.9934357938.

The spelling of 66920170 in words is "sixty-six million, nine hundred twenty thousand, one hundred seventy".