67553813 has 2 divisors, whose sum is σ = 67553814. Its totient is φ = 67553812.

The previous prime is 67553791. The next prime is 67553831. The reversal of 67553813 is 31835576.

Together with next prime (67553831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52171729 + 15382084 = 7223^2 + 3922^2 .

It is a cyclic number.

It is not a de Polignac number, because 67553813 - 2¹² = 67549717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67553833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33776906 + 33776907.

It is an arithmetic number, because the mean of its divisors is an integer number (33776907).

Almost surely, 2^67553813 is an apocalyptic number.

It is an amenable number.

67553813 is a deficient number, since it is larger than the sum of its proper divisors (1).

67553813 is an equidigital number, since it uses as much as digits as its factorization.

67553813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 38.

The square root of 67553813 is about 8219.1126650022. The cubic root of 67553813 is about 407.2708144559.

The spelling of 67553813 in words is "sixty-seven million, five hundred fifty-three thousand, eight hundred thirteen".