68906394461 has 4 divisors (see below), whose sum is σ = 69027495900. Its totient is φ = 68785293024.

The previous prime is 68906394451. The next prime is 68906394481. The reversal of 68906394461 is 16449360986.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16449360986 = 2 ⋅8224680493.

It can be written as a sum of positive squares in 2 ways, for example, as 15598511236 + 53307883225 = 124894^2 + 230885^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68906394461 is a prime.

It is a super-2 number, since 2×68906394461² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68906394397 and 68906394406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68906394421) 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, 60549866 + ... + 60551003.

It is an arithmetic number, because the mean of its divisors is an integer number (17256873975).

Almost surely, 2^68906394461 is an apocalyptic number.

It is an amenable number.

68906394461 is a deficient number, since it is larger than the sum of its proper divisors (121101439).

68906394461 is a wasteful number, since it uses less digits than its factorization.

68906394461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121101438.

The product of its (nonzero) digits is 6718464, while the sum is 56.

The spelling of 68906394461 in words is "sixty-eight billion, nine hundred six million, three hundred ninety-four thousand, four hundred sixty-one".