65385781 has 8 divisors (see below), whose sum is σ = 65889824. Its totient is φ = 64884240.

The previous prime is 65385779. The next prime is 65385797. The reversal of 65385781 is 18758356.

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

It is a cyclic number.

It is not a de Polignac number, because 65385781 - 2¹ = 65385779 is a prime.

It is a super-2 number, since 2×65385781² = 8550600713959922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65385701) 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, 114226 + ... + 114796.

It is an arithmetic number, because the mean of its divisors is an integer number (8236228).

Almost surely, 2^65385781 is an apocalyptic number.

It is an amenable number.

65385781 is a deficient number, since it is larger than the sum of its proper divisors (504043).

65385781 is a wasteful number, since it uses less digits than its factorization.

65385781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251.

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

The square root of 65385781 is about 8086.1474757761. The cubic root of 65385781 is about 402.8664532963.

It can be divided in two parts, 65385 and 781, that added together give a palindrome (66166).

The spelling of 65385781 in words is "sixty-five million, three hundred eighty-five thousand, seven hundred eighty-one".