68406253851 has 16 divisors (see below), whose sum is σ = 98229096224. Its totient is φ = 42094128384.

The previous prime is 68406253841. The next prime is 68406253921. The reversal of 68406253851 is 15835260486.

It is a happy number.

It is not a de Polignac number, because 68406253851 - 2²³ = 68397865243 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68406253851.

It is not an unprimeable number, because it can be changed into a prime (68406253841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1407285 + ... + 1455081.

It is an arithmetic number, because the mean of its divisors is an integer number (6139318514).

Almost surely, 2^68406253851 is an apocalyptic number.

68406253851 is a deficient number, since it is larger than the sum of its proper divisors (29822842373).

68406253851 is a wasteful number, since it uses less digits than its factorization.

68406253851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84510.

The product of its (nonzero) digits is 1382400, while the sum is 48.

The spelling of 68406253851 in words is "sixty-eight billion, four hundred six million, two hundred fifty-three thousand, eight hundred fifty-one".