99767420081 has 4 divisors (see below), whose sum is σ = 114019908672. Its totient is φ = 85514931492.

The previous prime is 99767420059. The next prime is 99767420119. The reversal of 99767420081 is 18002476799.

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: 18002476799 = 37 ⋅486553427.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99767420081 is a prime.

It is a super-2 number, since 2×99767420081² (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 (99767420581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7126244285 + ... + 7126244298.

It is an arithmetic number, because the mean of its divisors is an integer number (28504977168).

Almost surely, 2^99767420081 is an apocalyptic number.

It is an amenable number.

99767420081 is a deficient number, since it is larger than the sum of its proper divisors (14252488591).

99767420081 is a wasteful number, since it uses less digits than its factorization.

99767420081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14252488590.

The product of its (nonzero) digits is 1524096, while the sum is 53.

The spelling of 99767420081 in words is "ninety-nine billion, seven hundred sixty-seven million, four hundred twenty thousand, eighty-one".