998685282372521 has 2 divisors, whose sum is σ = 998685282372522. Its totient is φ = 998685282372520.

The previous prime is 998685282372493. The next prime is 998685282372539. The reversal of 998685282372521 is 125273282586899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 969175833664921 + 29509448707600 = 31131589^2 + 5432260^2 .

It is a cyclic number.

It is not a de Polignac number, because 998685282372521 - 2⁴² = 994287235861417 is a prime.

It is not a weakly prime, because it can be changed into another prime (998685282372571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499342641186260 + 499342641186261.

It is an arithmetic number, because the mean of its divisors is an integer number (499342641186261).

Almost surely, 2^{998685282372521} is an apocalyptic number.

It is an amenable number.

998685282372521 is a deficient number, since it is larger than the sum of its proper divisors (1).

998685282372521 is an equidigital number, since it uses as much as digits as its factorization.

998685282372521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2090188800, while the sum is 77.

The spelling of 998685282372521 in words is "nine hundred ninety-eight trillion, six hundred eighty-five billion, two hundred eighty-two million, three hundred seventy-two thousand, five hundred twenty-one".