64660778503 has 2 divisors, whose sum is σ = 64660778504. Its totient is φ = 64660778502.

The previous prime is 64660778461. The next prime is 64660778521. The reversal of 64660778503 is 30587706646.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64660778503 - 2⁹ = 64660777991 is a prime.

It is a super-2 number, since 2×64660778503² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64660778803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32330389251 + 32330389252.

It is an arithmetic number, because the mean of its divisors is an integer number (32330389252).

Almost surely, 2^64660778503 is an apocalyptic number.

64660778503 is a deficient number, since it is larger than the sum of its proper divisors (1).

64660778503 is an equidigital number, since it uses as much as digits as its factorization.

64660778503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5080320, while the sum is 52.

The spelling of 64660778503 in words is "sixty-four billion, six hundred sixty million, seven hundred seventy-eight thousand, five hundred three".