998994478725 has 216 divisors, whose sum is σ = 1942513028352. Its totient is φ = 490460832000.

The previous prime is 998994478693. The next prime is 998994478793. The reversal of 998994478725 is 527874499899.

998994478725 is a `hidden beast` number, since 9 + 9 + 8 + 99 + 447 + 87 + 2 + 5 = 666.

It is not a de Polignac number, because 998994478725 - 2⁵ = 998994478693 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 576452959 + ... + 576454691.

It is an arithmetic number, because the mean of its divisors is an integer number (8993115872).

Almost surely, 2^998994478725 is an apocalyptic number.

998994478725 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

998994478725 is a deficient number, since it is larger than the sum of its proper divisors (943518549627).

998994478725 is a wasteful number, since it uses less digits than its factorization.

998994478725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1985 (or 1958 counting only the distinct ones).

The product of its digits is 3292047360, while the sum is 81.

The spelling of 998994478725 in words is "nine hundred ninety-eight billion, nine hundred ninety-four million, four hundred seventy-eight thousand, seven hundred twenty-five".