65570661504 has 96 divisors (see below), whose sum is σ = 189063201600. Its totient is φ = 21813241344.

The previous prime is 65570661503. The next prime is 65570661509. The reversal of 65570661504 is 40516607556.

65570661504 is a `hidden beast` number, since 6 + 5 + 570 + 66 + 15 + 0 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a self number, because there is not a number n which added to its sum of digits gives 65570661504.

It is not an unprimeable number, because it can be changed into a prime (65570661503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 522877 + ... + 636035.

It is an arithmetic number, because the mean of its divisors is an integer number (1969408350).

Almost surely, 2^65570661504 is an apocalyptic number.

65570661504 is a gapful number since it is divisible by the number (64) 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 65570661504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94531600800).

65570661504 is an abundant number, since it is smaller than the sum of its proper divisors (123492540096).

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

65570661504 is a wasteful number, since it uses less digits than its factorization.

65570661504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113682 (or 113667 counting only the distinct ones).

The product of its (nonzero) digits is 756000, while the sum is 45.

The spelling of 65570661504 in words is "sixty-five billion, five hundred seventy million, six hundred sixty-one thousand, five hundred four".