65531630 has 16 divisors (see below), whose sum is σ = 120467520. Its totient is φ = 25654752.

The previous prime is 65531581. The next prime is 65531633. The reversal of 65531630 is 3613556.

It is a junction number, because it is equal to n+sod(n) for n = 65531593 and 65531602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65531633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69245 + ... + 70184.

It is an arithmetic number, because the mean of its divisors is an integer number (7529220).

Almost surely, 2^65531630 is an apocalyptic number.

65531630 is a deficient number, since it is larger than the sum of its proper divisors (54935890).

65531630 is a wasteful number, since it uses less digits than its factorization.

65531630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139483.

The product of its (nonzero) digits is 8100, while the sum is 29.

The square root of 65531630 is about 8095.1609001922. The cubic root of 65531630 is about 403.1657744146.

The spelling of 65531630 in words is "sixty-five million, five hundred thirty-one thousand, six hundred thirty".