1861299122885 has 8 divisors (see below), whose sum is σ = 2233586868216. Its totient is φ = 1489020684480.

The previous prime is 1861299122861. The next prime is 1861299122941. The reversal of 1861299122885 is 5882219921681.

It can be written as a sum of positive squares in 4 ways, for example, as 1155433657921 + 705865464964 = 1074911^2 + 840158^2 .

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

It is not a de Polignac number, because 1861299122885 - 2⁸ = 1861299122629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1878914 + ... + 2693123.

It is an arithmetic number, because the mean of its divisors is an integer number (279198358527).

Almost surely, 2^{1861299122885} is an apocalyptic number.

It is an amenable number.

1861299122885 is a deficient number, since it is larger than the sum of its proper divisors (372287745331).

1861299122885 is an equidigital number, since it uses as much as digits as its factorization.

1861299122885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4653463.

The product of its digits is 9953280, while the sum is 62.

The spelling of 1861299122885 in words is "one trillion, eight hundred sixty-one billion, two hundred ninety-nine million, one hundred twenty-two thousand, eight hundred eighty-five".