77700007771 has 2 divisors, whose sum is σ = 77700007772. Its totient is φ = 77700007770.

The previous prime is 77700007769. The next prime is 77700007793. The reversal of 77700007771 is 17770000777.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77700007771 - 2¹ = 77700007769 is a prime.

It is a super-2 number, since 2×77700007771² (a number of 23 digits) contains 22 as substring.

Together with 77700007769, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (77700007171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38850003885 + 38850003886.

It is an arithmetic number, because the mean of its divisors is an integer number (38850003886).

Almost surely, 2^77700007771 is an apocalyptic number.

77700007771 is a deficient number, since it is larger than the sum of its proper divisors (1).

77700007771 is an equidigital number, since it uses as much as digits as its factorization.

77700007771 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 117649, while the sum is 43.

The spelling of 77700007771 in words is "seventy-seven billion, seven hundred million, seven thousand, seven hundred seventy-one".