65211721170 has 32 divisors (see below), whose sum is σ = 156514887360. Its totient is φ = 17389041600.

The previous prime is 65211721151. The next prime is 65211721171. The reversal of 65211721170 is 7112711256.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (65211721171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1223436 + ... + 1275624.

It is an arithmetic number, because the mean of its divisors is an integer number (4891090230).

Almost surely, 2^65211721170 is an apocalyptic number.

65211721170 is an abundant number, since it is smaller than the sum of its proper divisors (91303166190).

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

65211721170 is a wasteful number, since it uses less digits than its factorization.

65211721170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93850.

The product of its (nonzero) digits is 5880, while the sum is 33.

The spelling of 65211721170 in words is "sixty-five billion, two hundred eleven million, seven hundred twenty-one thousand, one hundred seventy".