77908063687 has 2 divisors, whose sum is σ = 77908063688. Its totient is φ = 77908063686.

The previous prime is 77908063621. The next prime is 77908063693. The reversal of 77908063687 is 78636080977.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77908063687 - 2⁷ = 77908063559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77908063187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38954031843 + 38954031844.

It is an arithmetic number, because the mean of its divisors is an integer number (38954031844).

Almost surely, 2^77908063687 is an apocalyptic number.

77908063687 is a deficient number, since it is larger than the sum of its proper divisors (1).

77908063687 is an equidigital number, since it uses as much as digits as its factorization.

77908063687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21337344, while the sum is 61.

The spelling of 77908063687 in words is "seventy-seven billion, nine hundred eight million, sixty-three thousand, six hundred eighty-seven".