65766613 has 4 divisors (see below), whose sum is σ = 71745408. Its totient is φ = 59787820.

The previous prime is 65766611. The next prime is 65766671. The reversal of 65766613 is 31666756.

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 65766613 - 2¹ = 65766611 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65766611) 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, 2989381 + ... + 2989402.

It is an arithmetic number, because the mean of its divisors is an integer number (17936352).

Almost surely, 2^65766613 is an apocalyptic number.

It is an amenable number.

65766613 is a deficient number, since it is larger than the sum of its proper divisors (5978795).

65766613 is a wasteful number, since it uses less digits than its factorization.

65766613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5978794.

The product of its digits is 136080, while the sum is 40.

The square root of 65766613 is about 8109.6617068778. The cubic root of 65766613 is about 403.6470895305.

The spelling of 65766613 in words is "sixty-five million, seven hundred sixty-six thousand, six hundred thirteen".