65724542864 has 30 divisors (see below), whose sum is σ = 131581625670. Its totient is φ = 31802190720.

The previous prime is 65724542861. The next prime is 65724542867. The reversal of 65724542864 is 46824542756.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (65724542861) and next prime (65724542867).

It can be written as a sum of positive squares in only one way, i.e., 44855851264 + 20868691600 = 211792^2 + 144460^2 .

It is not an unprimeable number, because it can be changed into a prime (65724542861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2121869 + ... + 2152620.

It is an arithmetic number, because the mean of its divisors is an integer number (4386054189).

Almost surely, 2^65724542864 is an apocalyptic number.

It is an amenable number.

65724542864 is an abundant number, since it is smaller than the sum of its proper divisors (65857082806).

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

65724542864 is a wasteful number, since it uses less digits than its factorization.

65724542864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4274559 (or 4274522 counting only the distinct ones).

The product of its digits is 12902400, while the sum is 53.

The spelling of 65724542864 in words is "sixty-five billion, seven hundred twenty-four million, five hundred forty-two thousand, eight hundred sixty-four".