65646493 has 6 divisors (see below), whose sum is σ = 72157022. Its totient is φ = 59678520.

The previous prime is 65646487. The next prime is 65646523. The reversal of 65646493 is 39464656.

It can be written as a sum of positive squares in only one way, i.e., 59629284 + 6017209 = 7722^2 + 2453^2 .

It is not a de Polignac number, because 65646493 - 2¹⁷ = 65515421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65646293) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 271146 + ... + 271387.

Almost surely, 2^65646493 is an apocalyptic number.

It is an amenable number.

65646493 is a deficient number, since it is larger than the sum of its proper divisors (6510529).

65646493 is a wasteful number, since it uses less digits than its factorization.

65646493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542555 (or 542544 counting only the distinct ones).

The product of its digits is 466560, while the sum is 43.

The square root of 65646493 is about 8102.2523411703. The cubic root of 65646493 is about 403.4011915211.

The spelling of 65646493 in words is "sixty-five million, six hundred forty-six thousand, four hundred ninety-three".