1861325524889 has 4 divisors (see below), whose sum is σ = 1880514447924. Its totient is φ = 1842136601856.

The previous prime is 1861325524829. The next prime is 1861325524943. The reversal of 1861325524889 is 9884255231681.

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 556019274889 + 1305306250000 = 745667^2 + 1142500^2 .

It is a cyclic number.

It is not a de Polignac number, because 1861325524889 - 2²⁰ = 1861324476313 is a prime.

It is a super-2 number, since 2×1861325524889² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1861325524819) 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, 9594461372 + ... + 9594461565.

It is an arithmetic number, because the mean of its divisors is an integer number (470128611981).

Almost surely, 2^{1861325524889} is an apocalyptic number.

It is an amenable number.

1861325524889 is a deficient number, since it is larger than the sum of its proper divisors (19188923035).

1861325524889 is an equidigital number, since it uses as much as digits as its factorization.

1861325524889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19188923034.

The product of its digits is 33177600, while the sum is 62.

The spelling of 1861325524889 in words is "one trillion, eight hundred sixty-one billion, three hundred twenty-five million, five hundred twenty-four thousand, eight hundred eighty-nine".