68878415661 has 16 divisors (see below), whose sum is σ = 100191667008. Its totient is φ = 41742460800.

The previous prime is 68878415657. The next prime is 68878415699. The reversal of 68878415661 is 16651487886.

It is a happy number.

It is not a de Polignac number, because 68878415661 - 2² = 68878415657 is a prime.

It is a super-3 number, since 3×68878415661³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 68878415595 and 68878415604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68878415761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 905151 + ... + 978291.

It is an arithmetic number, because the mean of its divisors is an integer number (6261979188).

Almost surely, 2^68878415661 is an apocalyptic number.

It is an amenable number.

68878415661 is a deficient number, since it is larger than the sum of its proper divisors (31313251347).

68878415661 is a wasteful number, since it uses less digits than its factorization.

68878415661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101692.

The product of its digits is 15482880, while the sum is 60.

The spelling of 68878415661 in words is "sixty-eight billion, eight hundred seventy-eight million, four hundred fifteen thousand, six hundred sixty-one".