65457691 has 4 divisors (see below), whose sum is σ = 70492912. Its totient is φ = 60422472.

The previous prime is 65457683. The next prime is 65457719. The reversal of 65457691 is 19675456.

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 65457691 - 2³ = 65457683 is a prime.

It is a super-2 number, since 2×65457691² = 8569418622102962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65457671) 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, 2517591 + ... + 2517616.

It is an arithmetic number, because the mean of its divisors is an integer number (17623228).

Almost surely, 2^65457691 is an apocalyptic number.

65457691 is a deficient number, since it is larger than the sum of its proper divisors (5035221).

65457691 is a wasteful number, since it uses less digits than its factorization.

65457691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5035220.

The product of its digits is 226800, while the sum is 43.

The square root of 65457691 is about 8090.5927471354. The cubic root of 65457691 is about 403.0140873968.

The spelling of 65457691 in words is "sixty-five million, four hundred fifty-seven thousand, six hundred ninety-one".