65795781 has 4 divisors (see below), whose sum is σ = 87727712. Its totient is φ = 43863852.

The previous prime is 65795777. The next prime is 65795783. The reversal of 65795781 is 18759756.

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 not a de Polignac number, because 65795781 - 2² = 65795777 is a prime.

It is a super-2 number, since 2×65795781² = 8658169594799922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 65795781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65795783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10965961 + ... + 10965966.

It is an arithmetic number, because the mean of its divisors is an integer number (21931928).

Almost surely, 2^65795781 is an apocalyptic number.

It is an amenable number.

65795781 is a deficient number, since it is larger than the sum of its proper divisors (21931931).

65795781 is a wasteful number, since it uses less digits than its factorization.

65795781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21931930.

The product of its digits is 529200, while the sum is 48.

The square root of 65795781 is about 8111.4598562774. The cubic root of 65795781 is about 403.7067542431.

The spelling of 65795781 in words is "sixty-five million, seven hundred ninety-five thousand, seven hundred eighty-one".