75777761 has 2 divisors, whose sum is σ = 75777762. Its totient is φ = 75777760.

The previous prime is 75777749. The next prime is 75777763. The reversal of 75777761 is 16777757.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65918161 + 9859600 = 8119^2 + 3140^2 .

It is a cyclic number.

It is not a de Polignac number, because 75777761 - 2⁶ = 75777697 is a prime.

Together with 75777763, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (75777763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37888880 + 37888881.

It is an arithmetic number, because the mean of its divisors is an integer number (37888881).

Almost surely, 2^75777761 is an apocalyptic number.

It is an amenable number.

75777761 is a deficient number, since it is larger than the sum of its proper divisors (1).

75777761 is an equidigital number, since it uses as much as digits as its factorization.

75777761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504210, while the sum is 47.

The square root of 75777761 is about 8705.0422744522. The cubic root of 75777761 is about 423.1690758508.

The spelling of 75777761 in words is "seventy-five million, seven hundred seventy-seven thousand, seven hundred sixty-one".