68712978353 has 4 divisors (see below), whose sum is σ = 68739916608. Its totient is φ = 68686040100.

The previous prime is 68712978349. The next prime is 68712978379. The reversal of 68712978353 is 35387921786.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68712978353 - 2² = 68712978349 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68712978292 and 68712978301.

It is not an unprimeable number, because it can be changed into a prime (68712978253) 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, 13465301 + ... + 13470402.

It is an arithmetic number, because the mean of its divisors is an integer number (17184979152).

Almost surely, 2^68712978353 is an apocalyptic number.

It is an amenable number.

68712978353 is a deficient number, since it is larger than the sum of its proper divisors (26938255).

68712978353 is a wasteful number, since it uses less digits than its factorization.

68712978353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26938254.

The product of its digits is 15240960, while the sum is 59.

The spelling of 68712978353 in words is "sixty-eight billion, seven hundred twelve million, nine hundred seventy-eight thousand, three hundred fifty-three".