68823551 has 4 divisors (see below), whose sum is σ = 68871504. Its totient is φ = 68775600.

The previous prime is 68823541. The next prime is 68823563. The reversal of 68823551 is 15532886.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15532886 = 2 ⋅7766443.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68823551 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 (68823511) 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, 21755 + ... + 24716.

It is an arithmetic number, because the mean of its divisors is an integer number (17217876).

Almost surely, 2^68823551 is an apocalyptic number.

68823551 is a deficient number, since it is larger than the sum of its proper divisors (47953).

68823551 is a wasteful number, since it uses less digits than its factorization.

68823551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47952.

The product of its digits is 57600, while the sum is 38.

The square root of 68823551 is about 8295.9960824484. The cubic root of 68823551 is about 409.8066726857.

The spelling of 68823551 in words is "sixty-eight million, eight hundred twenty-three thousand, five hundred fifty-one".