1990850224897 has 4 divisors (see below), whose sum is σ = 2018122145860. Its totient is φ = 1963578303936.

The previous prime is 1990850224849. The next prime is 1990850224927. The reversal of 1990850224897 is 7984220580991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1706879538576 + 283970686321 = 1306476^2 + 532889^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1990850224897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1990850224397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13635960372 + ... + 13635960517.

It is an arithmetic number, because the mean of its divisors is an integer number (504530536465).

Almost surely, 2^{1990850224897} is an apocalyptic number.

It is an amenable number.

1990850224897 is a deficient number, since it is larger than the sum of its proper divisors (27271920963).

1990850224897 is an equidigital number, since it uses as much as digits as its factorization.

1990850224897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27271920962.

The product of its (nonzero) digits is 26127360, while the sum is 64.

The spelling of 1990850224897 in words is "one trillion, nine hundred ninety billion, eight hundred fifty million, two hundred twenty-four thousand, eight hundred ninety-seven".