65716557 has 4 divisors (see below), whose sum is σ = 87622080. Its totient is φ = 43811036.

The previous prime is 65716549. The next prime is 65716561. The reversal of 65716557 is 75561756.

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 65716557 - 2³ = 65716549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65716517) 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, 10952757 + ... + 10952762.

It is an arithmetic number, because the mean of its divisors is an integer number (21905520).

Almost surely, 2^65716557 is an apocalyptic number.

It is an amenable number.

65716557 is a deficient number, since it is larger than the sum of its proper divisors (21905523).

65716557 is a wasteful number, since it uses less digits than its factorization.

65716557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21905522.

The product of its digits is 220500, while the sum is 42.

The square root of 65716557 is about 8106.5749240971. The cubic root of 65716557 is about 403.5446561627.

The spelling of 65716557 in words is "sixty-five million, seven hundred sixteen thousand, five hundred fifty-seven".