68542155 has 24 divisors (see below), whose sum is σ = 129607920. Its totient is φ = 33232320.

The previous prime is 68542153. The next prime is 68542163. The reversal of 68542155 is 55124586.

68542155 is a `hidden beast` number, since 68 + 542 + 1 + 55 = 666.

It is not a de Polignac number, because 68542155 - 2¹ = 68542153 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68542153) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68740 + ... + 69729.

It is an arithmetic number, because the mean of its divisors is an integer number (5400330).

Almost surely, 2^68542155 is an apocalyptic number.

68542155 is a deficient number, since it is larger than the sum of its proper divisors (61065765).

68542155 is a wasteful number, since it uses less digits than its factorization.

68542155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138491 (or 138488 counting only the distinct ones).

The product of its digits is 48000, while the sum is 36.

The square root of 68542155 is about 8279.0189636212. The cubic root of 68542155 is about 409.2473899014.

Subtracting from 68542155 its reverse (55124586), we obtain a square (13417569 = 3663²).

It can be divided in two parts, 6854 and 2155, that added together give a palindrome (9009).

The spelling of 68542155 in words is "sixty-eight million, five hundred forty-two thousand, one hundred fifty-five".