99778281005 has 16 divisors (see below), whose sum is σ = 129081348144. Its totient is φ = 73604075520.

The previous prime is 99778280983. The next prime is 99778281019. The reversal of 99778281005 is 50018287799.

It can be written as a sum of positive squares in 8 ways, for example, as 3835696489 + 95942584516 = 61933^2 + 309746^2 .

It is not a de Polignac number, because 99778281005 - 2¹² = 99778276909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 754484 + ... + 876813.

It is an arithmetic number, because the mean of its divisors is an integer number (8067584259).

Almost surely, 2^99778281005 is an apocalyptic number.

It is an amenable number.

99778281005 is a deficient number, since it is larger than the sum of its proper divisors (29303067139).

99778281005 is a wasteful number, since it uses less digits than its factorization.

99778281005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632256.

The product of its (nonzero) digits is 2540160, while the sum is 56.

The spelling of 99778281005 in words is "ninety-nine billion, seven hundred seventy-eight million, two hundred eighty-one thousand, five".