65668157 has 4 divisors (see below), whose sum is σ = 65863356. Its totient is φ = 65472960.

The previous prime is 65668153. The next prime is 65668171. The reversal of 65668157 is 75186656.

65668157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10106041 + 55562116 = 3179^2 + 7454^2 .

It is a cyclic number.

It is not a de Polignac number, because 65668157 - 2² = 65668153 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 (65668153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97094 + ... + 97767.

It is an arithmetic number, because the mean of its divisors is an integer number (16465839).

Almost surely, 2^65668157 is an apocalyptic number.

It is an amenable number.

65668157 is a deficient number, since it is larger than the sum of its proper divisors (195199).

65668157 is a wasteful number, since it uses less digits than its factorization.

65668157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195198.

The product of its digits is 302400, while the sum is 44.

The square root of 65668157 is about 8103.5891430896. The cubic root of 65668157 is about 403.4455621181.

The spelling of 65668157 in words is "sixty-five million, six hundred sixty-eight thousand, one hundred fifty-seven".