65665152720 has 240 divisors, whose sum is σ = 233270069760. Its totient is φ = 16519624704.

The previous prime is 65665152703. The next prime is 65665152803. The reversal of 65665152720 is 2725156656.

65665152720 is a `hidden beast` number, since 6 + 5 + 66 + 515 + 2 + 72 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 1181721 + ... + 1236039.

It is an arithmetic number, because the mean of its divisors is an integer number (971958624).

Almost surely, 2^65665152720 is an apocalyptic number.

65665152720 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 65665152720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116635034880).

65665152720 is an abundant number, since it is smaller than the sum of its proper divisors (167604917040).

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

65665152720 is a wasteful number, since it uses less digits than its factorization.

65665152720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54434 (or 54425 counting only the distinct ones).

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

The spelling of 65665152720 in words is "sixty-five billion, six hundred sixty-five million, one hundred fifty-two thousand, seven hundred twenty".