65880208857 has 4 divisors (see below), whose sum is σ = 87840278480. Its totient is φ = 43920139236.

The previous prime is 65880208819. The next prime is 65880208871. The reversal of 65880208857 is 75880208856.

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 not a de Polignac number, because 65880208857 - 2¹¹ = 65880206809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65880208797 and 65880208806.

It is not an unprimeable number, because it can be changed into a prime (65888208857) 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, 10980034807 + ... + 10980034812.

It is an arithmetic number, because the mean of its divisors is an integer number (21960069620).

Almost surely, 2^65880208857 is an apocalyptic number.

It is an amenable number.

65880208857 is a deficient number, since it is larger than the sum of its proper divisors (21960069623).

65880208857 is a wasteful number, since it uses less digits than its factorization.

65880208857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21960069622.

The product of its (nonzero) digits is 8601600, while the sum is 57.

Subtracting 65880208857 from its reverse (75880208856), we obtain a palindrome (9999999999).

The spelling of 65880208857 in words is "sixty-five billion, eight hundred eighty million, two hundred eight thousand, eight hundred fifty-seven".