999978000529 has 2 divisors, whose sum is σ = 999978000530. Its totient is φ = 999978000528.

The previous prime is 999978000521. The next prime is 999978000557. The reversal of 999978000529 is 925000879999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 911305072129 + 88672928400 = 954623^2 + 297780^2 .

It is a cyclic number.

It is not a de Polignac number, because 999978000529 - 2³ = 999978000521 is a prime.

It is not a weakly prime, because it can be changed into another prime (999978000521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499989000264 + 499989000265.

It is an arithmetic number, because the mean of its divisors is an integer number (499989000265).

Almost surely, 2^999978000529 is an apocalyptic number.

It is an amenable number.

999978000529 is a deficient number, since it is larger than the sum of its proper divisors (1).

999978000529 is an equidigital number, since it uses as much as digits as its factorization.

999978000529 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33067440, while the sum is 67.

The spelling of 999978000529 in words is "nine hundred ninety-nine billion, nine hundred seventy-eight million, five hundred twenty-nine", and thus it is an aban number.