77906663 has 2 divisors, whose sum is σ = 77906664. Its totient is φ = 77906662.

The previous prime is 77906657. The next prime is 77906677. The reversal of 77906663 is 36660977.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77906663 - 2⁶ = 77906599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77906263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38953331 + 38953332.

It is an arithmetic number, because the mean of its divisors is an integer number (38953332).

Almost surely, 2^77906663 is an apocalyptic number.

77906663 is a deficient number, since it is larger than the sum of its proper divisors (1).

77906663 is an equidigital number, since it uses as much as digits as its factorization.

77906663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 285768, while the sum is 44.

The square root of 77906663 is about 8826.4751175087. The cubic root of 77906663 is about 427.0953740160.

The spelling of 77906663 in words is "seventy-seven million, nine hundred six thousand, six hundred sixty-three".