68949802257 has 64 divisors (see below), whose sum is σ = 112189132800. Its totient is φ = 36769075200.

The previous prime is 68949802249. The next prime is 68949802279. The reversal of 68949802257 is 75220894986.

It is not a de Polignac number, because 68949802257 - 2³ = 68949802249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68949802257.

It is not an unprimeable number, because it can be changed into a prime (68949802217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 46305369 + ... + 46306857.

It is an arithmetic number, because the mean of its divisors is an integer number (1752955200).

Almost surely, 2^68949802257 is an apocalyptic number.

It is an amenable number.

68949802257 is a deficient number, since it is larger than the sum of its proper divisors (43239330543).

68949802257 is a wasteful number, since it uses less digits than its factorization.

68949802257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2526.

The product of its (nonzero) digits is 17418240, while the sum is 60.

The spelling of 68949802257 in words is "sixty-eight billion, nine hundred forty-nine million, eight hundred two thousand, two hundred fifty-seven".