65274685781 has 4 divisors (see below), whose sum is σ = 65352487200. Its totient is φ = 65196884364.

The previous prime is 65274685753. The next prime is 65274685799. The reversal of 65274685781 is 18758647256.

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 a de Polignac number, because none of the positive numbers 2^k-65274685781 is a prime.

It is a super-2 number, since 2×65274685781² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65274685781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65274685381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38899451 + ... + 38901128.

It is an arithmetic number, because the mean of its divisors is an integer number (16338121800).

Almost surely, 2^65274685781 is an apocalyptic number.

It is an amenable number.

65274685781 is a deficient number, since it is larger than the sum of its proper divisors (77801419).

65274685781 is an equidigital number, since it uses as much as digits as its factorization.

65274685781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77801418.

The product of its digits is 22579200, while the sum is 59.

The spelling of 65274685781 in words is "sixty-five billion, two hundred seventy-four million, six hundred eighty-five thousand, seven hundred eighty-one".