99243378417 has 4 divisors (see below), whose sum is σ = 132324504560. Its totient is φ = 66162252276.

The previous prime is 99243378401. The next prime is 99243378469. The reversal of 99243378417 is 71487334299.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71487334299 = 3 ⋅23829111433.

It is not a de Polignac number, because 99243378417 - 2⁴ = 99243378401 is a prime.

It is a super-2 number, since 2×99243378417² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99243378917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16540563067 + ... + 16540563072.

It is an arithmetic number, because the mean of its divisors is an integer number (33081126140).

Almost surely, 2^99243378417 is an apocalyptic number.

It is an amenable number.

99243378417 is a deficient number, since it is larger than the sum of its proper divisors (33081126143).

99243378417 is a wasteful number, since it uses less digits than its factorization.

99243378417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33081126142.

The product of its digits is 9144576, while the sum is 57.

The spelling of 99243378417 in words is "ninety-nine billion, two hundred forty-three million, three hundred seventy-eight thousand, four hundred seventeen".