999504724681 has 8 divisors (see below), whose sum is σ = 999921674024. Its totient is φ = 999087851520.

The previous prime is 999504724663. The next prime is 999504724709. The reversal of 999504724681 is 186427405999.

It can be written as a sum of positive squares in 4 ways, for example, as 45053883081 + 954450841600 = 212259^2 + 976960^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 4-Lehmer number, since φ(999504724681) divides (999504724681-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 999504724681 - 2¹⁷ = 999504593609 is a prime.

It is a super-2 number, since 2×999504724681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999504724601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54857485 + ... + 54875701.

It is an arithmetic number, because the mean of its divisors is an integer number (124990209253).

It is a Poulet number, since it divides 2^999504724680-1.

Almost surely, 2^999504724681 is an apocalyptic number.

It is an amenable number.

999504724681 is a deficient number, since it is larger than the sum of its proper divisors (416949343).

999504724681 is a wasteful number, since it uses less digits than its factorization.

999504724681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38091.

The product of its (nonzero) digits is 39191040, while the sum is 64.

The spelling of 999504724681 in words is "nine hundred ninety-nine billion, five hundred four million, seven hundred twenty-four thousand, six hundred eighty-one".