65781385 has 8 divisors (see below), whose sum is σ = 78998976. Its totient is φ = 52584240.

The previous prime is 65781379. The next prime is 65781409. The reversal of 65781385 is 58318756.

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

It is not a de Polignac number, because 65781385 - 2¹⁹ = 65257097 is a prime.

It is a super-2 number, since 2×65781385² = 8654381225036450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3202 + ... + 11908.

It is an arithmetic number, because the mean of its divisors is an integer number (9874872).

Almost surely, 2^65781385 is an apocalyptic number.

It is an amenable number.

65781385 is a deficient number, since it is larger than the sum of its proper divisors (13217591).

65781385 is a wasteful number, since it uses less digits than its factorization.

65781385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10223.

The product of its digits is 201600, while the sum is 43.

The square root of 65781385 is about 8110.5724212290. The cubic root of 65781385 is about 403.6773086552.

It can be divided in two parts, 65781 and 385, that added together give a palindrome (66166).

The spelling of 65781385 in words is "sixty-five million, seven hundred eighty-one thousand, three hundred eighty-five".