65811950 has 12 divisors (see below), whose sum is σ = 122410320. Its totient is φ = 26324760.

The previous prime is 65811931. The next prime is 65811961. The reversal of 65811950 is 5911856.

It is a self number, because there is not a number n which added to its sum of digits gives 65811950.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 658070 + ... + 658169.

It is an arithmetic number, because the mean of its divisors is an integer number (10200860).

Almost surely, 2^65811950 is an apocalyptic number.

65811950 is a deficient number, since it is larger than the sum of its proper divisors (56598370).

65811950 is a wasteful number, since it uses less digits than its factorization.

65811950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1316251 (or 1316246 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 65811950 is about 8112.4564713778. The cubic root of 65811950 is about 403.7398212056.

The spelling of 65811950 in words is "sixty-five million, eight hundred eleven thousand, nine hundred fifty".