998742395641 has 3 divisors (see below), whose sum is σ = 998743395013. Its totient is φ = 998741396270.

The previous prime is 998742395633. The next prime is 998742395653. The reversal of 998742395641 is 146593247899.

The square root of 998742395641 is 999371.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 998742395641 - 2³ = 998742395633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998742395621) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 499686 + ... + 1499056.

Almost surely, 2^998742395641 is an apocalyptic number.

998742395641 is the 999371-st square number.

998742395641 is the 499686-th centered octagonal number.

It is an amenable number.

998742395641 is a deficient number, since it is larger than the sum of its proper divisors (999372).

998742395641 is an frugal number, since it uses more digits than its factorization.

998742395641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1998742 (or 999371 counting only the distinct ones).

The product of its digits is 117573120, while the sum is 67.

The spelling of 998742395641 in words is "nine hundred ninety-eight billion, seven hundred forty-two million, three hundred ninety-five thousand, six hundred forty-one".