65678521751 has 4 divisors (see below), whose sum is σ = 65679486912. Its totient is φ = 65677556592.

The previous prime is 65678521739. The next prime is 65678521759. The reversal of 65678521751 is 15712587656.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65678521751 - 2³⁴ = 48498652567 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65678521693 and 65678521702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65678521759) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 372071 + ... + 519416.

It is an arithmetic number, because the mean of its divisors is an integer number (16419871728).

Almost surely, 2^65678521751 is an apocalyptic number.

65678521751 is a deficient number, since it is larger than the sum of its proper divisors (965161).

65678521751 is an equidigital number, since it uses as much as digits as its factorization.

65678521751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965160.

The product of its digits is 3528000, while the sum is 53.

The spelling of 65678521751 in words is "sixty-five billion, six hundred seventy-eight million, five hundred twenty-one thousand, seven hundred fifty-one".