65697691 has 4 divisors (see below), whose sum is σ = 65823832. Its totient is φ = 65571552.

The previous prime is 65697689. The next prime is 65697701. The reversal of 65697691 is 19679656.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65697691 - 2¹ = 65697689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65697631) 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, 62286 + ... + 63331.

It is an arithmetic number, because the mean of its divisors is an integer number (16455958).

Almost surely, 2^65697691 is an apocalyptic number.

65697691 is a deficient number, since it is larger than the sum of its proper divisors (126141).

65697691 is a wasteful number, since it uses less digits than its factorization.

65697691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126140.

The product of its digits is 612360, while the sum is 49.

The square root of 65697691 is about 8105.4112172055. The cubic root of 65697691 is about 403.5060357475.

The spelling of 65697691 in words is "sixty-five million, six hundred ninety-seven thousand, six hundred ninety-one".