998566257 has 8 divisors (see below), whose sum is σ = 1433838784. Its totient is φ = 614502288.

The previous prime is 998566243. The next prime is 998566297. The reversal of 998566257 is 752665899.

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

It is not a de Polignac number, because 998566257 - 2¹² = 998562161 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 998566197 and 998566206.

It is not an unprimeable number, because it can be changed into a prime (998566297) 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, 12802093 + ... + 12802170.

It is an arithmetic number, because the mean of its divisors is an integer number (179229848).

Almost surely, 2^998566257 is an apocalyptic number.

It is an amenable number.

998566257 is a deficient number, since it is larger than the sum of its proper divisors (435272527).

998566257 is a wasteful number, since it uses less digits than its factorization.

998566257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25604279.

The product of its digits is 8164800, while the sum is 57.

The square root of 998566257 is about 31600.0990030095. The cubic root of 998566257 is about 999.5218570825.

The spelling of 998566257 in words is "nine hundred ninety-eight million, five hundred sixty-six thousand, two hundred fifty-seven".