77666733444331 has 2 divisors, whose sum is σ = 77666733444332. Its totient is φ = 77666733444330.

The previous prime is 77666733444329. The next prime is 77666733444407. The reversal of 77666733444331 is 13344433766677.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77666733444331 - 2¹ = 77666733444329 is a prime.

It is a super-2 number, since 2×77666733444331² (a number of 29 digits) contains 22 as substring.

Together with 77666733444329, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (77666733448331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38833366722165 + 38833366722166.

It is an arithmetic number, because the mean of its divisors is an integer number (38833366722166).

Almost surely, 2^{77666733444331} is an apocalyptic number.

77666733444331 is a deficient number, since it is larger than the sum of its proper divisors (1).

77666733444331 is an equidigital number, since it uses as much as digits as its factorization.

77666733444331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384072192, while the sum is 64.

The spelling of 77666733444331 in words is "seventy-seven trillion, six hundred sixty-six billion, seven hundred thirty-three million, four hundred forty-four thousand, three hundred thirty-one".