999826007569 has 9 divisors (see below), whose sum is σ = 1055238081417. Its totient is φ = 947185587684.

The previous prime is 999826007561. The next prime is 999826007597. The reversal of 999826007569 is 965700628999.

The square root of 999826007569 is 999913.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 999826007569 - 2³ = 999826007561 is a prime.

It is a super-2 number, since 2×999826007569² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 999826007498 and 999826007507.

It is not an unprimeable number, because it can be changed into a prime (999826007561) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 18972034 + ... + 19024660.

It is an arithmetic number, because the mean of its divisors is an integer number (117248675713).

Almost surely, 2^999826007569 is an apocalyptic number.

999826007569 is the 999913-rd square number.

999826007569 is the 499957-th centered octagonal number.

It is an amenable number.

999826007569 is a deficient number, since it is larger than the sum of its proper divisors (55412073848).

999826007569 is an frugal number, since it uses more digits than its factorization.

999826007569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105292 (or 52646 counting only the distinct ones).

The product of its (nonzero) digits is 132269760, while the sum is 70.

The spelling of 999826007569 in words is "nine hundred ninety-nine billion, eight hundred twenty-six million, seven thousand, five hundred sixty-nine".