68031625477 has 4 divisors (see below), whose sum is σ = 68655768940. Its totient is φ = 67407482016.

The previous prime is 68031625439. The next prime is 68031625481. The reversal of 68031625477 is 77452613086.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24387819556 + 43643805921 = 156166^2 + 208911^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68031625477 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 68031625477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68031625427) 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, 312071568 + ... + 312071785.

It is an arithmetic number, because the mean of its divisors is an integer number (17163942235).

Almost surely, 2^68031625477 is an apocalyptic number.

It is an amenable number.

68031625477 is a deficient number, since it is larger than the sum of its proper divisors (624143463).

68031625477 is a wasteful number, since it uses less digits than its factorization.

68031625477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624143462.

The product of its (nonzero) digits is 1693440, while the sum is 49.

The spelling of 68031625477 in words is "sixty-eight billion, thirty-one million, six hundred twenty-five thousand, four hundred seventy-seven".