77660651 has 2 divisors, whose sum is σ = 77660652. Its totient is φ = 77660650.

The previous prime is 77660567. The next prime is 77660689. The reversal of 77660651 is 15606677.

It is an a-pointer prime, because the next prime (77660689) can be obtained adding 77660651 to its sum of digits (38).

It is a strong prime.

It is an emirp because it is prime and its reverse (15606677) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77660651 - 2¹⁰ = 77659627 is a prime.

It is not a weakly prime, because it can be changed into another prime (77660851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38830325 + 38830326.

It is an arithmetic number, because the mean of its divisors is an integer number (38830326).

Almost surely, 2^77660651 is an apocalyptic number.

77660651 is a deficient number, since it is larger than the sum of its proper divisors (1).

77660651 is an equidigital number, since it uses as much as digits as its factorization.

77660651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 77660651 is about 8812.5280708773. The cubic root of 77660651 is about 426.6453424266.

The spelling of 77660651 in words is "seventy-seven million, six hundred sixty thousand, six hundred fifty-one".