65705687818 has 8 divisors (see below), whose sum is σ = 98688730212. Its totient is φ = 32809444416.

The previous prime is 65705687813. The next prime is 65705687821. The reversal of 65705687818 is 81878650756.

It can be written as a sum of positive squares in 2 ways, for example, as 61428135409 + 4277552409 = 247847^2 + 65403^2 .

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

It is a super-2 number, since 2×65705687818² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65705687813) 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, 21697855 + ... + 21700882.

Almost surely, 2^65705687818 is an apocalyptic number.

65705687818 is a deficient number, since it is larger than the sum of its proper divisors (32983042394).

65705687818 is a wasteful number, since it uses less digits than its factorization.

65705687818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43399496.

The product of its (nonzero) digits is 22579200, while the sum is 61.

The spelling of 65705687818 in words is "sixty-five billion, seven hundred five million, six hundred eighty-seven thousand, eight hundred eighteen".