68615641 has 2 divisors, whose sum is σ = 68615642. Its totient is φ = 68615640.

The previous prime is 68615639. The next prime is 68615671. The reversal of 68615641 is 14651686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56190016 + 12425625 = 7496^2 + 3525^2 .

It is a cyclic number.

It is not a de Polignac number, because 68615641 - 2¹ = 68615639 is a prime.

Together with 68615639, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 68615641.

It is not a weakly prime, because it can be changed into another prime (68615611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34307820 + 34307821.

It is an arithmetic number, because the mean of its divisors is an integer number (34307821).

Almost surely, 2^68615641 is an apocalyptic number.

It is an amenable number.

68615641 is a deficient number, since it is larger than the sum of its proper divisors (1).

68615641 is an equidigital number, since it uses as much as digits as its factorization.

68615641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 37.

The square root of 68615641 is about 8283.4558609315. The cubic root of 68615641 is about 409.3935929321.

The spelling of 68615641 in words is "sixty-eight million, six hundred fifteen thousand, six hundred forty-one".