68155642 has 4 divisors (see below), whose sum is σ = 102233466. Its totient is φ = 34077820.

The previous prime is 68155589. The next prime is 68155643. The reversal of 68155642 is 24655186.

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

It can be written as a sum of positive squares in only one way, i.e., 47734281 + 20421361 = 6909^2 + 4519^2 .

It is not an unprimeable number, because it can be changed into a prime (68155643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17038909 + ... + 17038912.

Almost surely, 2^68155642 is an apocalyptic number.

68155642 is a deficient number, since it is larger than the sum of its proper divisors (34077824).

68155642 is a wasteful number, since it uses less digits than its factorization.

68155642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34077823.

The product of its digits is 57600, while the sum is 37.

The square root of 68155642 is about 8255.6430397638. The cubic root of 68155642 is about 408.4766831788.

The spelling of 68155642 in words is "sixty-eight million, one hundred fifty-five thousand, six hundred forty-two".