68966621 has 4 divisors (see below), whose sum is σ = 70267932. Its totient is φ = 67665312.

The previous prime is 68966593. The next prime is 68966641. The reversal of 68966621 is 12666986.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43099225 + 25867396 = 6565^2 + 5086^2 .

It is a de Polignac number, because none of the positive numbers 2^k-68966621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68966641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 650576 + ... + 650681.

It is an arithmetic number, because the mean of its divisors is an integer number (17566983).

Almost surely, 2^68966621 is an apocalyptic number.

It is an amenable number.

68966621 is a deficient number, since it is larger than the sum of its proper divisors (1301311).

68966621 is a wasteful number, since it uses less digits than its factorization.

68966621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1301310.

The product of its digits is 186624, while the sum is 44.

The square root of 68966621 is about 8304.6144401772. The cubic root of 68966621 is about 410.0904440565.

The spelling of 68966621 in words is "sixty-eight million, nine hundred sixty-six thousand, six hundred twenty-one".