77420663 has 2 divisors, whose sum is σ = 77420664. Its totient is φ = 77420662.

The previous prime is 77420659. The next prime is 77420677. The reversal of 77420663 is 36602477.

It is a weak prime.

It is an emirp because it is prime and its reverse (36602477) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77420663 - 2² = 77420659 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77423663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38710331 + 38710332.

It is an arithmetic number, because the mean of its divisors is an integer number (38710332).

Almost surely, 2^77420663 is an apocalyptic number.

77420663 is a deficient number, since it is larger than the sum of its proper divisors (1).

77420663 is an equidigital number, since it uses as much as digits as its factorization.

77420663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 35.

The square root of 77420663 is about 8798.9012382229. The cubic root of 77420663 is about 426.2054138771.

The spelling of 77420663 in words is "seventy-seven million, four hundred twenty thousand, six hundred sixty-three".