1801213620650 has 12 divisors (see below), whose sum is σ = 3350257334502. Its totient is φ = 720485448240.

The previous prime is 1801213620641. The next prime is 1801213620691. The reversal of 1801213620650 is 560263121081.

It is a Cunningham number, because it is equal to 1342093²+1.

It can be written as a sum of positive squares in 3 ways, for example, as 1659997751281 + 141215869369 = 1288409^2 + 375787^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1801213620650.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18012136157 + ... + 18012136256.

Almost surely, 2^{1801213620650} is an apocalyptic number.

1801213620650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1801213620650 is a deficient number, since it is larger than the sum of its proper divisors (1549043713852).

1801213620650 is a wasteful number, since it uses less digits than its factorization.

1801213620650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36024272425 (or 36024272420 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The spelling of 1801213620650 in words is "one trillion, eight hundred one billion, two hundred thirteen million, six hundred twenty thousand, six hundred fifty".