65721500700 has 72 divisors (see below), whose sum is σ = 190274665392. Its totient is φ = 17514631680.

The previous prime is 65721500687. The next prime is 65721500743. The reversal of 65721500700 is 700512756.

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 23 ways as a sum of consecutive naturals, for example, 410512 + ... + 547688.

It is an arithmetic number, because the mean of its divisors is an integer number (2642703686).

Almost surely, 2^65721500700 is an apocalyptic number.

65721500700 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65721500700 is an abundant number, since it is smaller than the sum of its proper divisors (124553164692).

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

65721500700 is a wasteful number, since it uses less digits than its factorization.

65721500700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138791 (or 138784 counting only the distinct ones).

The product of its (nonzero) digits is 14700, while the sum is 33.

The spelling of 65721500700 in words is "sixty-five billion, seven hundred twenty-one million, five hundred thousand, seven hundred".