68690649361 has 16 divisors (see below), whose sum is σ = 73658218320. Its totient is φ = 63828244480.

The previous prime is 68690649353. The next prime is 68690649439. The reversal of 68690649361 is 16394609686.

It can be written as a sum of positive squares in 8 ways, for example, as 4247780625 + 64442868736 = 65175^2 + 253856^2 .

It is a cyclic number.

It is not a de Polignac number, because 68690649361 - 2³ = 68690649353 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68690649296 and 68690649305.

It is not an unprimeable number, because it can be changed into a prime (68690649161) 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, 990771 + ... + 1057831.

It is an arithmetic number, because the mean of its divisors is an integer number (4603638645).

Almost surely, 2^68690649361 is an apocalyptic number.

It is an amenable number.

68690649361 is a deficient number, since it is larger than the sum of its proper divisors (4967568959).

68690649361 is a wasteful number, since it uses less digits than its factorization.

68690649361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67844.

The product of its (nonzero) digits is 10077696, while the sum is 58.

The spelling of 68690649361 in words is "sixty-eight billion, six hundred ninety million, six hundred forty-nine thousand, three hundred sixty-one".