67771973 has 2 divisors, whose sum is σ = 67771974. Its totient is φ = 67771972.

The previous prime is 67771937. The next prime is 67771997. The reversal of 67771973 is 37917776.

Together with previous prime (67771937) 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., 51595489 + 16176484 = 7183^2 + 4022^2 .

It is a cyclic number.

It is not a de Polignac number, because 67771973 - 2¹⁸ = 67509829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67771373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33885986 + 33885987.

It is an arithmetic number, because the mean of its divisors is an integer number (33885987).

Almost surely, 2^67771973 is an apocalyptic number.

It is an amenable number.

67771973 is a deficient number, since it is larger than the sum of its proper divisors (1).

67771973 is an equidigital number, since it uses as much as digits as its factorization.

67771973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 388962, while the sum is 47.

The square root of 67771973 is about 8232.3734730635. The cubic root of 67771973 is about 407.7087602611.

The spelling of 67771973 in words is "sixty-seven million, seven hundred seventy-one thousand, nine hundred seventy-three".