1801053251765 has 4 divisors (see below), whose sum is σ = 2161263902124. Its totient is φ = 1440842601408.

The previous prime is 1801053251761. The next prime is 1801053251819. The reversal of 1801053251765 is 5671523501081.

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 302933555236 + 1498119696529 = 550394^2 + 1223977^2 .

It is a cyclic number.

It is not a de Polignac number, because 1801053251765 - 2² = 1801053251761 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1801053251761) 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, 180105325172 + ... + 180105325181.

It is an arithmetic number, because the mean of its divisors is an integer number (540315975531).

Almost surely, 2^{1801053251765} is an apocalyptic number.

It is an amenable number.

1801053251765 is a deficient number, since it is larger than the sum of its proper divisors (360210650359).

1801053251765 is an equidigital number, since it uses as much as digits as its factorization.

1801053251765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360210650358.

The product of its (nonzero) digits is 252000, while the sum is 44.

The spelling of 1801053251765 in words is "one trillion, eight hundred one billion, fifty-three million, two hundred fifty-one thousand, seven hundred sixty-five".