999765774197 has 4 divisors (see below), whose sum is σ = 1043233851360. Its totient is φ = 956297697036.

The previous prime is 999765774107. The next prime is 999765774229. The reversal of 999765774197 is 791477567999.

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.

It is a cyclic number.

It is not a de Polignac number, because 999765774197 - 2²⁰ = 999764725621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999765774107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21734038547 + ... + 21734038592.

It is an arithmetic number, because the mean of its divisors is an integer number (260808462840).

Almost surely, 2^999765774197 is an apocalyptic number.

It is an amenable number.

999765774197 is a deficient number, since it is larger than the sum of its proper divisors (43468077163).

999765774197 is a wasteful number, since it uses less digits than its factorization.

999765774197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43468077162.

The product of its digits is 1890355320, while the sum is 80.

The spelling of 999765774197 in words is "nine hundred ninety-nine billion, seven hundred sixty-five million, seven hundred seventy-four thousand, one hundred ninety-seven".