65366130640 has 80 divisors (see below), whose sum is σ = 158807692800. Its totient is φ = 24974360576.

The previous prime is 65366130611. The next prime is 65366130659. The reversal of 65366130640 is 4603166356.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 65366130593 and 65366130602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1298256 + ... + 1347664.

It is an arithmetic number, because the mean of its divisors is an integer number (1985096160).

Almost surely, 2^65366130640 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 65366130640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79403846400).

65366130640 is an abundant number, since it is smaller than the sum of its proper divisors (93441562160).

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

65366130640 is a wasteful number, since it uses less digits than its factorization.

65366130640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50164 (or 50158 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 40.

Adding to 65366130640 its reverse (4603166356), we get a palindrome (69969296996).

The spelling of 65366130640 in words is "sixty-five billion, three hundred sixty-six million, one hundred thirty thousand, six hundred forty".