65991950 has 12 divisors (see below), whose sum is σ = 122745120. Its totient is φ = 26396760.

The previous prime is 65991949. The next prime is 65991953. The reversal of 65991950 is 5919956.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65991953) by changing a digit.

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, 659870 + ... + 659969.

It is an arithmetic number, because the mean of its divisors is an integer number (10228760).

Almost surely, 2^65991950 is an apocalyptic number.

65991950 is a deficient number, since it is larger than the sum of its proper divisors (56753170).

65991950 is a wasteful number, since it uses less digits than its factorization.

65991950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1319851 (or 1319846 counting only the distinct ones).

The product of its (nonzero) digits is 109350, while the sum is 44.

The square root of 65991950 is about 8123.5429462766. The cubic root of 65991950 is about 404.1075711002.

The spelling of 65991950 in words is "sixty-five million, nine hundred ninety-one thousand, nine hundred fifty".