1990690882465 has 8 divisors (see below), whose sum is σ = 2389352149440. Its totient is φ = 1592203978992.

The previous prime is 1990690882393. The next prime is 1990690882487. The reversal of 1990690882465 is 5642880960991.

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

It is a cyclic number.

It is not a de Polignac number, because 1990690882465 - 2¹⁹ = 1990690358177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1990690882465.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 43565755 + ... + 43611424.

It is an arithmetic number, because the mean of its divisors is an integer number (298669018680).

Almost surely, 2^{1990690882465} is an apocalyptic number.

It is an amenable number.

1990690882465 is a deficient number, since it is larger than the sum of its proper divisors (398661266975).

1990690882465 is an equidigital number, since it uses as much as digits as its factorization.

1990690882465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87181751.

The product of its (nonzero) digits is 67184640, while the sum is 67.

The spelling of 1990690882465 in words is "one trillion, nine hundred ninety billion, six hundred ninety million, eight hundred eighty-two thousand, four hundred sixty-five".