68628661 has 2 divisors, whose sum is σ = 68628662. Its totient is φ = 68628660.

The previous prime is 68628649. The next prime is 68628697. The reversal of 68628661 is 16682686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59136100 + 9492561 = 7690^2 + 3081^2 .

It is a cyclic number.

It is not a de Polignac number, because 68628661 - 2¹³ = 68620469 is a prime.

It is a super-2 number, since 2×68628661² = 9419786221305842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68628061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34314330 + 34314331.

It is an arithmetic number, because the mean of its divisors is an integer number (34314331).

Almost surely, 2^68628661 is an apocalyptic number.

It is an amenable number.

68628661 is a deficient number, since it is larger than the sum of its proper divisors (1).

68628661 is an equidigital number, since it uses as much as digits as its factorization.

68628661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 43.

The square root of 68628661 is about 8284.2417275210. The cubic root of 68628661 is about 409.4194858014.

The spelling of 68628661 in words is "sixty-eight million, six hundred twenty-eight thousand, six hundred sixty-one".