996128561997 has 12 divisors (see below), whose sum is σ = 1438879348764. Its totient is φ = 664073255040.

The previous prime is 996128561983. The next prime is 996128561999. The reversal of 996128561997 is 799165821699.

It can be written as a sum of positive squares in 2 ways, for example, as 960613651881 + 35514910116 = 980109^2 + 188454^2 .

It is not a de Polignac number, because 996128561997 - 2¹² = 996128557901 is a prime.

It is a super-2 number, since 2×996128561997² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (996128561999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 517404 + ... + 1503317.

It is an arithmetic number, because the mean of its divisors is an integer number (119906612397).

Almost surely, 2^996128561997 is an apocalyptic number.

It is an amenable number.

996128561997 is a deficient number, since it is larger than the sum of its proper divisors (442750786767).

996128561997 is a wasteful number, since it uses less digits than its factorization.

996128561997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2075500 (or 2075497 counting only the distinct ones).

The product of its digits is 132269760, while the sum is 72.

The spelling of 996128561997 in words is "nine hundred ninety-six billion, one hundred twenty-eight million, five hundred sixty-one thousand, nine hundred ninety-seven".