65491550 has 12 divisors (see below), whose sum is σ = 121814376. Its totient is φ = 26196600.

The previous prime is 65491549. The next prime is 65491583. The reversal of 65491550 is 5519456.

It is a self number, because there is not a number n which added to its sum of digits gives 65491550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 654866 + ... + 654965.

It is an arithmetic number, because the mean of its divisors is an integer number (10151198).

Almost surely, 2^65491550 is an apocalyptic number.

65491550 is a deficient number, since it is larger than the sum of its proper divisors (56322826).

65491550 is a wasteful number, since it uses less digits than its factorization.

65491550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1309843 (or 1309838 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 65491550 is about 8092.6849685379. The cubic root of 65491550 is about 403.0835638359.

The spelling of 65491550 in words is "sixty-five million, four hundred ninety-one thousand, five hundred fifty".