67540751977 has 2 divisors, whose sum is σ = 67540751978. Its totient is φ = 67540751976.

The previous prime is 67540751969. The next prime is 67540751981. The reversal of 67540751977 is 77915704576.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52150116496 + 15390635481 = 228364^2 + 124059^2 .

It is a cyclic number.

It is not a de Polignac number, because 67540751977 - 2³ = 67540751969 is a prime.

It is not a weakly prime, because it can be changed into another prime (67540755977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33770375988 + 33770375989.

It is an arithmetic number, because the mean of its divisors is an integer number (33770375989).

Almost surely, 2^67540751977 is an apocalyptic number.

It is an amenable number.

67540751977 is a deficient number, since it is larger than the sum of its proper divisors (1).

67540751977 is an equidigital number, since it uses as much as digits as its factorization.

67540751977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12965400, while the sum is 58.

The spelling of 67540751977 in words is "sixty-seven billion, five hundred forty million, seven hundred fifty-one thousand, nine hundred seventy-seven".