76756661 has 2 divisors, whose sum is σ = 76756662. Its totient is φ = 76756660.

The previous prime is 76756573. The next prime is 76756663. The reversal of 76756661 is 16665767.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75082225 + 1674436 = 8665^2 + 1294^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-76756661 is a prime.

It is a Sophie Germain prime.

Together with 76756663, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76756663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38378330 + 38378331.

It is an arithmetic number, because the mean of its divisors is an integer number (38378331).

Almost surely, 2^76756661 is an apocalyptic number.

It is an amenable number.

76756661 is a deficient number, since it is larger than the sum of its proper divisors (1).

76756661 is an equidigital number, since it uses as much as digits as its factorization.

76756661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 44.

The square root of 76756661 is about 8761.0878890695. The cubic root of 76756661 is about 424.9834567955.

The spelling of 76756661 in words is "seventy-six million, seven hundred fifty-six thousand, six hundred sixty-one".