99868640401 has 4 divisors (see below), whose sum is σ = 99906230052. Its totient is φ = 99831050752.

The previous prime is 99868640393. The next prime is 99868640471. The reversal of 99868640401 is 10404686899.

It is a Cunningham number, because it is equal to 316020²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10404686899 = 47 ⋅221376317.

It can be written as a sum of positive squares in 2 ways, for example, as 65088255376 + 34780385025 = 255124^2 + 186495^2 .

It is a cyclic number.

It is not a de Polignac number, because 99868640401 - 2³ = 99868640393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99868640471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18790840 + ... + 18796153.

It is an arithmetic number, because the mean of its divisors is an integer number (24976557513).

Almost surely, 2^99868640401 is an apocalyptic number.

It is an amenable number.

99868640401 is a deficient number, since it is larger than the sum of its proper divisors (37589651).

99868640401 is a wasteful number, since it uses less digits than its factorization.

99868640401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37589650.

The product of its (nonzero) digits is 2985984, while the sum is 55.

The spelling of 99868640401 in words is "ninety-nine billion, eight hundred sixty-eight million, six hundred forty thousand, four hundred one".