65691007 has 4 divisors (see below), whose sum is σ = 67088736. Its totient is φ = 64293280.

The previous prime is 65690981. The next prime is 65691047. The reversal of 65691007 is 70019656.

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 65691007 - 2⁷ = 65690879 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 (65691047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 698794 + ... + 698887.

It is an arithmetic number, because the mean of its divisors is an integer number (16772184).

Almost surely, 2^65691007 is an apocalyptic number.

65691007 is a deficient number, since it is larger than the sum of its proper divisors (1397729).

65691007 is a wasteful number, since it uses less digits than its factorization.

65691007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1397728.

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 65691007 is about 8104.9988895743. The cubic root of 65691007 is about 403.4923512188.

The spelling of 65691007 in words is "sixty-five million, six hundred ninety-one thousand, seven".