65278580817 has 8 divisors (see below), whose sum is σ = 87066666400. Its totient is φ = 43504774560.

The previous prime is 65278580813. The next prime is 65278580819. The reversal of 65278580817 is 71808587256.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 65278580817 - 2² = 65278580813 is a prime.

It is a super-2 number, since 2×65278580817² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65278580813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3559159 + ... + 3577452.

It is an arithmetic number, because the mean of its divisors is an integer number (10883333300).

Almost surely, 2^65278580817 is an apocalyptic number.

It is an amenable number.

65278580817 is a deficient number, since it is larger than the sum of its proper divisors (21788085583).

65278580817 is a wasteful number, since it uses less digits than its factorization.

65278580817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7139663.

The product of its (nonzero) digits is 7526400, while the sum is 57.

The spelling of 65278580817 in words is "sixty-five billion, two hundred seventy-eight million, five hundred eighty thousand, eight hundred seventeen".