998432952551 has 4 divisors (see below), whose sum is σ = 1005133845000. Its totient is φ = 991732060104.

The previous prime is 998432952493. The next prime is 998432952557. The reversal of 998432952551 is 155259234899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155259234899 = 61 ⋅2545233359.

It is a cyclic number.

It is not a de Polignac number, because 998432952551 - 2³⁸ = 723555045607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998432952557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3350446001 + ... + 3350446298.

It is an arithmetic number, because the mean of its divisors is an integer number (251283461250).

Almost surely, 2^998432952551 is an apocalyptic number.

998432952551 is a deficient number, since it is larger than the sum of its proper divisors (6700892449).

998432952551 is a wasteful number, since it uses less digits than its factorization.

998432952551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6700892448.

The product of its digits is 34992000, while the sum is 62.

The spelling of 998432952551 in words is "nine hundred ninety-eight billion, four hundred thirty-two million, nine hundred fifty-two thousand, five hundred fifty-one".