67651 has 2 divisors, whose sum is σ = 67652. Its totient is φ = 67650.

The previous prime is 67631. The next prime is 67679. The reversal of 67651 is 15676.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 67651 - 2⁵ = 67619 is a prime.

It is not a weakly prime, because it can be changed into another prime (67601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33825 + 33826.

It is an arithmetic number, because the mean of its divisors is an integer number (33826).

2⁶⁷⁶⁵¹ is an apocalyptic number.

67651 is the 165-th centered pentagonal number.

67651 is a deficient number, since it is larger than the sum of its proper divisors (1).

67651 is an equidigital number, since it uses as much as digits as its factorization.

67651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1260, while the sum is 25.

The square root of 67651 is about 260.0980584318. The cubic root of 67651 is about 40.7466029010.

Adding to 67651 its sum of digits (25), we get a palindrome (67676).

It can be divided in two parts, 676 and 51, that added together give a palindrome (727).

The spelling of 67651 in words is "sixty-seven thousand, six hundred fifty-one".