66371770 has 8 divisors (see below), whose sum is σ = 119469204. Its totient is φ = 26548704.

The previous prime is 66371759. The next prime is 66371777. The reversal of 66371770 is 7717366.

It can be written as a sum of positive squares in 2 ways, for example, as 58232161 + 8139609 = 7631^2 + 2853^2 .

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 (66371777) 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, 3318579 + ... + 3318598.

Almost surely, 2^66371770 is an apocalyptic number.

66371770 is a deficient number, since it is larger than the sum of its proper divisors (53097434).

66371770 is a wasteful number, since it uses less digits than its factorization.

66371770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6637184.

The product of its (nonzero) digits is 37044, while the sum is 37.

The square root of 66371770 is about 8146.8871355874. The cubic root of 66371770 is about 404.8813756125.

The spelling of 66371770 in words is "sixty-six million, three hundred seventy-one thousand, seven hundred seventy".