65640466 has 4 divisors (see below), whose sum is σ = 98460702. Its totient is φ = 32820232.

The previous prime is 65640461. The next prime is 65640481. The reversal of 65640466 is 66404656.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 61293241 + 4347225 = 7829^2 + 2085^2 .

It is not an unprimeable number, because it can be changed into a prime (65640461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16410115 + ... + 16410118.

Almost surely, 2^65640466 is an apocalyptic number.

65640466 is a deficient number, since it is larger than the sum of its proper divisors (32820236).

65640466 is a wasteful number, since it uses less digits than its factorization.

65640466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32820235.

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 65640466 is about 8101.8803990185. The cubic root of 65640466 is about 403.3888457314.

The spelling of 65640466 in words is "sixty-five million, six hundred forty thousand, four hundred sixty-six".