64161995520 has 432 divisors, whose sum is σ = 244216613088. Its totient is φ = 14306181120.

The previous prime is 64161995453. The next prime is 64161995537. The reversal of 64161995520 is 2559916146.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 64161995520.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7710402 + ... + 7718718.

It is an arithmetic number, because the mean of its divisors is an integer number (565316234).

Almost surely, 2^64161995520 is an apocalyptic number.

64161995520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64161995520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122108306544).

64161995520 is an abundant number, since it is smaller than the sum of its proper divisors (180054617568).

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

64161995520 is a wasteful number, since it uses less digits than its factorization.

64161995520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8396 (or 8375 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 48.

The spelling of 64161995520 in words is "sixty-four billion, one hundred sixty-one million, nine hundred ninety-five thousand, five hundred twenty".