65642950820 has 24 divisors (see below), whose sum is σ = 143843684544. Its totient is φ = 25115563616.

The previous prime is 65642950817. The next prime is 65642950853. The reversal of 65642950820 is 2805924656.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71350574 + ... + 71351493.

It is an arithmetic number, because the mean of its divisors is an integer number (5993486856).

Almost surely, 2^65642950820 is an apocalyptic number.

It is an amenable number.

65642950820 is an abundant number, since it is smaller than the sum of its proper divisors (78200733724).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65642950820 is a wasteful number, since it uses less digits than its factorization.

65642950820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142702099 (or 142702097 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 47.

The spelling of 65642950820 in words is "sixty-five billion, six hundred forty-two million, nine hundred fifty thousand, eight hundred twenty".