99173138451 has 16 divisors (see below), whose sum is σ = 135337196544. Its totient is φ = 64562962464.

The previous prime is 99173138431. The next prime is 99173138507. The reversal of 99173138451 is 15483137199.

It is not a de Polignac number, because 99173138451 - 2⁵ = 99173138419 is a prime.

It is a super-3 number, since 3×99173138451³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 99173138394 and 99173138403.

It is not an unprimeable number, because it can be changed into a prime (99173138431) 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, 487225 + ... + 660101.

It is an arithmetic number, because the mean of its divisors is an integer number (8458574784).

Almost surely, 2^99173138451 is an apocalyptic number.

99173138451 is a deficient number, since it is larger than the sum of its proper divisors (36164058093).

99173138451 is a wasteful number, since it uses less digits than its factorization.

99173138451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177370.

The product of its digits is 816480, while the sum is 51.

The spelling of 99173138451 in words is "ninety-nine billion, one hundred seventy-three million, one hundred thirty-eight thousand, four hundred fifty-one".