65740385988 has 36 divisors (see below), whose sum is σ = 166794870060. Its totient is φ = 21831996096.

The previous prime is 65740385983. The next prime is 65740386007. The reversal of 65740385988 is 88958304756.

65740385988 is a `hidden beast` number, since 6 + 5 + 7 + 4 + 0 + 38 + 598 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4240353924 + 61500032064 = 65118^2 + 247992^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×65740385988² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65740385983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3384595 + ... + 3403962.

It is an arithmetic number, because the mean of its divisors is an integer number (4633190835).

Almost surely, 2^65740385988 is an apocalyptic number.

It is an amenable number.

65740385988 is an abundant number, since it is smaller than the sum of its proper divisors (101054484072).

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

65740385988 is a wasteful number, since it uses less digits than its factorization.

65740385988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6788836 (or 6788831 counting only the distinct ones).

The product of its (nonzero) digits is 58060800, while the sum is 63.

The spelling of 65740385988 in words is "sixty-five billion, seven hundred forty million, three hundred eighty-five thousand, nine hundred eighty-eight".