68973440251 has 8 divisors (see below), whose sum is σ = 69767466480. Its totient is φ = 68182636032.

The previous prime is 68973440243. The next prime is 68973440279. The reversal of 68973440251 is 15204437986.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68973440251 - 2³ = 68973440243 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68973440195 and 68973440204.

It is not an unprimeable number, because it can be changed into a prime (68973440551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 762430 + ... + 848083.

It is an arithmetic number, because the mean of its divisors is an integer number (8720933310).

It is a 2-persistent number, because it is pandigital, and so is 2⋅68973440251 = 137946880502, but 3⋅68973440251 = 206920320753 is not.

Almost surely, 2^68973440251 is an apocalyptic number.

68973440251 is the 166101-st centered pentagonal number.

68973440251 is a deficient number, since it is larger than the sum of its proper divisors (794026229).

68973440251 is a wasteful number, since it uses less digits than its factorization.

68973440251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1611005.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 68973440251 in words is "sixty-eight billion, nine hundred seventy-three million, four hundred forty thousand, two hundred fifty-one".