65170987644 has 432 divisors, whose sum is σ = 195694561440. Its totient is φ = 16798924800.

The previous prime is 65170987643. The next prime is 65170987691. The reversal of 65170987644 is 44678907156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65170987643) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 671865804 + ... + 671865900.

It is an arithmetic number, because the mean of its divisors is an integer number (452996670).

Almost surely, 2^65170987644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65170987644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97847280720).

65170987644 is an abundant number, since it is smaller than the sum of its proper divisors (130523573796).

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

65170987644 is a wasteful number, since it uses less digits than its factorization.

65170987644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250 (or 210 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 57.

The spelling of 65170987644 in words is "sixty-five billion, one hundred seventy million, nine hundred eighty-seven thousand, six hundred forty-four".