68557655 has 4 divisors (see below), whose sum is σ = 82269192. Its totient is φ = 54846120.

The previous prime is 68557639. The next prime is 68557667. The reversal of 68557655 is 55675586.

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

It is not a de Polignac number, because 68557655 - 2⁴ = 68557639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 6855761 + ... + 6855770.

It is an arithmetic number, because the mean of its divisors is an integer number (20567298).

Almost surely, 2^68557655 is an apocalyptic number.

68557655 is a deficient number, since it is larger than the sum of its proper divisors (13711537).

68557655 is a wasteful number, since it uses less digits than its factorization.

68557655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13711536.

The product of its digits is 1260000, while the sum is 47.

The square root of 68557655 is about 8279.9550119551. The cubic root of 68557655 is about 409.2782363999.

The spelling of 68557655 in words is "sixty-eight million, five hundred fifty-seven thousand, six hundred fifty-five".