67012561 has 16 divisors (see below), whose sum is σ = 83727360. Its totient is φ = 52105680.

The previous prime is 67012559. The next prime is 67012567. The reversal of 67012561 is 16521076.

It is not a de Polignac number, because 67012561 - 2¹ = 67012559 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67012567) 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, 70290 + ... + 71236.

It is an arithmetic number, because the mean of its divisors is an integer number (5232960).

Almost surely, 2^67012561 is an apocalyptic number.

It is an amenable number.

67012561 is a deficient number, since it is larger than the sum of its proper divisors (16714799).

67012561 is a wasteful number, since it uses less digits than its factorization.

67012561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1884.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 67012561 is about 8186.1200211089. The cubic root of 67012561 is about 406.1801901032.

It can be divided in two parts, 670 and 12561, that added together give a palindrome (13231).

The spelling of 67012561 in words is "sixty-seven million, twelve thousand, five hundred sixty-one".