999066287521 has 16 divisors (see below), whose sum is σ = 1029149572176. Its totient is φ = 969494400000.

The previous prime is 999066287519. The next prime is 999066287539. The reversal of 999066287521 is 125782660999.

It can be written as a sum of positive squares in 8 ways, for example, as 125766692496 + 873299595025 = 354636^2 + 934505^2 .

It is a 5-Lehmer number, since φ(999066287521) divides (999066287521-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 999066287521 - 2¹ = 999066287519 is a prime.

It is a deceptive number, since it divides R_999066287520.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999066207521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1442701 + ... + 2019781.

It is an arithmetic number, because the mean of its divisors is an integer number (64321848261).

Almost surely, 2^999066287521 is an apocalyptic number.

999066287521 is the 577081-st octagonal number.

It is an amenable number.

999066287521 is a deficient number, since it is larger than the sum of its proper divisors (30083284655).

999066287521 is a wasteful number, since it uses less digits than its factorization.

999066287521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577524.

The product of its (nonzero) digits is 29393280, while the sum is 64.

The spelling of 999066287521 in words is "nine hundred ninety-nine billion, sixty-six million, two hundred eighty-seven thousand, five hundred twenty-one".