9999872745779 has 32 divisors (see below), whose sum is σ = 11835243171840. Its totient is φ = 8270199076608.

The previous prime is 9999872745773. The next prime is 9999872745829. The reversal of 9999872745779 is 9775472789999.

It is not a de Polignac number, because 9999872745779 - 2²⁰ = 9999871697203 is a prime.

It is a pancake number, because a pancake can be divided into 9999872745779 parts by 4472107 straight cuts.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9999872745773) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34166342 + ... + 34457780.

It is an arithmetic number, because the mean of its divisors is an integer number (369851349120).

Almost surely, 2^{9999872745779} is an apocalyptic number.

9999872745779 is a deficient number, since it is larger than the sum of its proper divisors (1835370426061).

9999872745779 is a wasteful number, since it uses less digits than its factorization.

9999872745779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292587.

The product of its digits is 45368527680, while the sum is 92.

The spelling of 9999872745779 in words is "nine trillion, nine hundred ninety-nine billion, eight hundred seventy-two million, seven hundred forty-five thousand, seven hundred seventy-nine".