99778822145 has 16 divisors (see below), whose sum is σ = 126045886080. Its totient is φ = 75616156800.

The previous prime is 99778822141. The next prime is 99778822223. The reversal of 99778822145 is 54122887799.

It is not a de Polignac number, because 99778822145 - 2² = 99778822141 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99778822141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1576460 + ... + 1638530.

It is an arithmetic number, because the mean of its divisors is an integer number (7877867880).

It is a Proth number, since it is equal to 190313 ⋅ 2¹⁹ + 1 and 190313 < 2¹⁹.

Almost surely, 2^99778822145 is an apocalyptic number.

99778822145 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

99778822145 is a deficient number, since it is larger than the sum of its proper divisors (26267063935).

99778822145 is a wasteful number, since it uses less digits than its factorization.

99778822145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79016.

The product of its digits is 20321280, while the sum is 62.

The spelling of 99778822145 in words is "ninety-nine billion, seven hundred seventy-eight million, eight hundred twenty-two thousand, one hundred forty-five".