65520648077 has 4 divisors (see below), whose sum is σ = 65557397280. Its totient is φ = 65483898876.

The previous prime is 65520648049. The next prime is 65520648139. The reversal of 65520648077 is 77084602556.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65520648077 - 2⁶ = 65520648013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65520648377) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18371927 + ... + 18375492.

It is an arithmetic number, because the mean of its divisors is an integer number (16389349320).

Almost surely, 2^65520648077 is an apocalyptic number.

It is an amenable number.

65520648077 is a deficient number, since it is larger than the sum of its proper divisors (36749203).

65520648077 is a wasteful number, since it uses less digits than its factorization.

65520648077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36749202.

The product of its (nonzero) digits is 2822400, while the sum is 50.

The spelling of 65520648077 in words is "sixty-five billion, five hundred twenty million, six hundred forty-eight thousand, seventy-seven".