999998745566447 has 8 divisors (see below), whose sum is σ = 1090937297192832. Its totient is φ = 909065123066200.

The previous prime is 999998745566437. The next prime is 999998745566497. The reversal of 999998745566447 is 744665547899999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 999998745566447 - 2¹⁸ = 999998745304303 is a prime.

It is a super-2 number, since 2×999998745566447² (a number of 31 digits) contains 22 as substring.

It is a pancake number, because a pancake can be divided into 999998745566447 parts by 44721331 straight cuts.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999998745566437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1231857329 + ... + 1232668842.

It is an arithmetic number, because the mean of its divisors is an integer number (136367162149104).

Almost surely, 2^{999998745566447} is an apocalyptic number.

999998745566447 is a deficient number, since it is larger than the sum of its proper divisors (90938551626385).

999998745566447 is a wasteful number, since it uses less digits than its factorization.

999998745566447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2464563069.

The product of its digits is 1333279180800, while the sum is 101.

The spelling of 999998745566447 in words is "nine hundred ninety-nine trillion, nine hundred ninety-eight billion, seven hundred forty-five million, five hundred sixty-six thousand, four hundred forty-seven".