999699240661 has 48 divisors (see below), whose sum is σ = 1138862462400. Its totient is φ = 870222348800.

The previous prime is 999699240649. The next prime is 999699240677. The reversal of 999699240661 is 166042996999.

It is not a de Polignac number, because 999699240661 - 2⁹ = 999699240149 is a prime.

It is a super-3 number, since 3×999699240661³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999699240641) 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 47 ways as a sum of consecutive naturals, for example, 942223071 + ... + 942224131.

It is an arithmetic number, because the mean of its divisors is an integer number (23726301300).

Almost surely, 2^999699240661 is an apocalyptic number.

It is an amenable number.

999699240661 is a deficient number, since it is larger than the sum of its proper divisors (139163221739).

999699240661 is a wasteful number, since it uses less digits than its factorization.

999699240661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1878 (or 1849 counting only the distinct ones).

The product of its (nonzero) digits is 102036672, while the sum is 70.

The spelling of 999699240661 in words is "nine hundred ninety-nine billion, six hundred ninety-nine million, two hundred forty thousand, six hundred sixty-one".