68266657 has 4 divisors (see below), whose sum is σ = 68402880. Its totient is φ = 68130436.

The previous prime is 68266633. The next prime is 68266661. The reversal of 68266657 is 75666286.

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 68266657 - 2¹⁵ = 68233889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68266157) 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, 67357 + ... + 68362.

It is an arithmetic number, because the mean of its divisors is an integer number (17100720).

Almost surely, 2^68266657 is an apocalyptic number.

It is an amenable number.

68266657 is a deficient number, since it is larger than the sum of its proper divisors (136223).

68266657 is a wasteful number, since it uses less digits than its factorization.

68266657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136222.

The product of its digits is 725760, while the sum is 46.

The square root of 68266657 is about 8262.3638869273. The cubic root of 68266657 is about 408.6983446525.

The spelling of 68266657 in words is "sixty-eight million, two hundred sixty-six thousand, six hundred fifty-seven".