77966071 has 2 divisors, whose sum is σ = 77966072. Its totient is φ = 77966070.

The previous prime is 77966069. The next prime is 77966107. The reversal of 77966071 is 17066977.

It is a happy number.

Together with next prime (77966107) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77966071 - 2¹ = 77966069 is a prime.

Together with 77966069, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77966171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38983035 + 38983036.

It is an arithmetic number, because the mean of its divisors is an integer number (38983036).

Almost surely, 2^77966071 is an apocalyptic number.

77966071 is a deficient number, since it is larger than the sum of its proper divisors (1).

77966071 is an equidigital number, since it uses as much as digits as its factorization.

77966071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 111132, while the sum is 43.

The square root of 77966071 is about 8829.8398060214. The cubic root of 77966071 is about 427.2039074599.

The spelling of 77966071 in words is "seventy-seven million, nine hundred sixty-six thousand, seventy-one".