76666657 has 2 divisors, whose sum is σ = 76666658. Its totient is φ = 76666656.

The previous prime is 76666649. The next prime is 76666663. The reversal of 76666657 is 75666667.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42198016 + 34468641 = 6496^2 + 5871^2 .

It is an emirp because it is prime and its reverse (75666667) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76666657 - 2³ = 76666649 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 76666657.

It is not a weakly prime, because it can be changed into another prime (76666607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38333328 + 38333329.

It is an arithmetic number, because the mean of its divisors is an integer number (38333329).

Almost surely, 2^76666657 is an apocalyptic number.

It is an amenable number.

76666657 is a deficient number, since it is larger than the sum of its proper divisors (1).

76666657 is an equidigital number, since it uses as much as digits as its factorization.

76666657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1905120, while the sum is 49.

The square root of 76666657 is about 8755.9498057035. The cubic root of 76666657 is about 424.8172815482.

The spelling of 76666657 in words is "seventy-six million, six hundred sixty-six thousand, six hundred fifty-seven".