68777537 has 2 divisors, whose sum is σ = 68777538. Its totient is φ = 68777536.

The previous prime is 68777519. The next prime is 68777543. The reversal of 68777537 is 73577786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68624656 + 152881 = 8284^2 + 391^2 .

It is a cyclic number.

It is not a de Polignac number, because 68777537 - 2¹⁴ = 68761153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68777557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34388768 + 34388769.

It is an arithmetic number, because the mean of its divisors is an integer number (34388769).

Almost surely, 2^68777537 is an apocalyptic number.

It is an amenable number.

68777537 is a deficient number, since it is larger than the sum of its proper divisors (1).

68777537 is an equidigital number, since it uses as much as digits as its factorization.

68777537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728720, while the sum is 50.

The square root of 68777537 is about 8293.2223532231. Note that the first 3 decimals coincide. The cubic root of 68777537 is about 409.7153229082.

The spelling of 68777537 in words is "sixty-eight million, seven hundred seventy-seven thousand, five hundred thirty-seven".