65047681 has 4 divisors (see below), whose sum is σ = 65831472. Its totient is φ = 64263892.

The previous prime is 65047673. The next prime is 65047699. The reversal of 65047681 is 18674056.

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 not a de Polignac number, because 65047681 - 2³ = 65047673 is a prime.

It is a super-2 number, since 2×65047681² = 8462401606955522, which 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 65047681.

It is not an unprimeable number, because it can be changed into a prime (65047601) 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, 391771 + ... + 391936.

It is an arithmetic number, because the mean of its divisors is an integer number (16457868).

Almost surely, 2^65047681 is an apocalyptic number.

It is an amenable number.

65047681 is a deficient number, since it is larger than the sum of its proper divisors (783791).

65047681 is an equidigital number, since it uses as much as digits as its factorization.

65047681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783790.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 65047681 is about 8065.2142562985. The cubic root of 65047681 is about 402.1708657907.

The spelling of 65047681 in words is "sixty-five million, forty-seven thousand, six hundred eighty-one".