778057663 has 2 divisors, whose sum is σ = 778057664. Its totient is φ = 778057662.

The previous prime is 778057613. The next prime is 778057711. The reversal of 778057663 is 366750877.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 778057663 - 2¹³ = 778049471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (778057613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389028831 + 389028832.

It is an arithmetic number, because the mean of its divisors is an integer number (389028832).

Almost surely, 2^778057663 is an apocalyptic number.

778057663 is a deficient number, since it is larger than the sum of its proper divisors (1).

778057663 is an equidigital number, since it uses as much as digits as its factorization.

778057663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1481760, while the sum is 49.

The square root of 778057663 is about 27893.6850021649. The cubic root of 778057663 is about 919.7516906272.

The spelling of 778057663 in words is "seven hundred seventy-eight million, fifty-seven thousand, six hundred sixty-three".