68564661 has 32 divisors (see below), whose sum is σ = 102981120. Its totient is φ = 40219200.

The previous prime is 68564659. The next prime is 68564701. The reversal of 68564661 is 16646586.

It is not a de Polignac number, because 68564661 - 2¹ = 68564659 is a prime.

It is a super-2 number, since 2×68564661² = 9402225476089842, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68564611) 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 31 ways as a sum of consecutive naturals, for example, 299295 + ... + 299523.

It is an arithmetic number, because the mean of its divisors is an integer number (3218160).

Almost surely, 2^68564661 is an apocalyptic number.

It is an amenable number.

68564661 is a deficient number, since it is larger than the sum of its proper divisors (34416459).

68564661 is a wasteful number, since it uses less digits than its factorization.

68564661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497.

The product of its digits is 207360, while the sum is 42.

The square root of 68564661 is about 8280.3780710786. The cubic root of 68564661 is about 409.2921774916.

The spelling of 68564661 in words is "sixty-eight million, five hundred sixty-four thousand, six hundred sixty-one".