1998040566475 has 6 divisors (see below), whose sum is σ = 2477570302460. Its totient is φ = 1598432453160.

The previous prime is 1998040566461. The next prime is 1998040566479. The reversal of 1998040566475 is 5746650408991.

It is not a de Polignac number, because 1998040566475 - 2¹¹ = 1998040564427 is a prime.

It is a super-2 number, since 2×1998040566475² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1998040566479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39960811305 + ... + 39960811354.

Almost surely, 2^{1998040566475} is an apocalyptic number.

1998040566475 is a deficient number, since it is larger than the sum of its proper divisors (479529735985).

1998040566475 is an equidigital number, since it uses as much as digits as its factorization.

1998040566475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79921622669 (or 79921622664 counting only the distinct ones).

The product of its (nonzero) digits is 65318400, while the sum is 64.

The spelling of 1998040566475 in words is "one trillion, nine hundred ninety-eight billion, forty million, five hundred sixty-six thousand, four hundred seventy-five".