65665970 has 8 divisors (see below), whose sum is σ = 118198764. Its totient is φ = 26266384.

The previous prime is 65665961. The next prime is 65665973. The reversal of 65665970 is 7956656.

It can be written as a sum of positive squares in 2 ways, for example, as 61952641 + 3713329 = 7871^2 + 1927^2 .

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 (65665973) 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, 3283289 + ... + 3283308.

Almost surely, 2^65665970 is an apocalyptic number.

65665970 is a deficient number, since it is larger than the sum of its proper divisors (52532794).

65665970 is a wasteful number, since it uses less digits than its factorization.

65665970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6566604.

The product of its (nonzero) digits is 340200, while the sum is 44.

The square root of 65665970 is about 8103.4542017587. The cubic root of 65665970 is about 403.4410833099.

The spelling of 65665970 in words is "sixty-five million, six hundred sixty-five thousand, nine hundred seventy".