67770257 has 2 divisors, whose sum is σ = 67770258. Its totient is φ = 67770256.

The previous prime is 67770239. The next prime is 67770289. The reversal of 67770257 is 75207776.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57168721 + 10601536 = 7561^2 + 3256^2 .

It is a cyclic number.

It is not a de Polignac number, because 67770257 - 2²⁶ = 661393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (67770217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33885128 + 33885129.

It is an arithmetic number, because the mean of its divisors is an integer number (33885129).

Almost surely, 2^67770257 is an apocalyptic number.

It is an amenable number.

67770257 is a deficient number, since it is larger than the sum of its proper divisors (1).

67770257 is an equidigital number, since it uses as much as digits as its factorization.

67770257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144060, while the sum is 41.

The square root of 67770257 is about 8232.2692497270. The cubic root of 67770257 is about 407.7053191428.

The spelling of 67770257 in words is "sixty-seven million, seven hundred seventy thousand, two hundred fifty-seven".