1861884885385 has 16 divisors (see below), whose sum is σ = 2566672407936. Its totient is φ = 1270105924608.

The previous prime is 1861884885383. The next prime is 1861884885431. The reversal of 1861884885385 is 5835884881681.

It is a cyclic number.

It is not a de Polignac number, because 1861884885385 - 2¹ = 1861884885383 is a prime.

It is a super-2 number, since 2×1861884885385² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1861884885383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137808559 + ... + 137822068.

It is an arithmetic number, because the mean of its divisors is an integer number (160417025496).

Almost surely, 2^{1861884885385} is an apocalyptic number.

It is an amenable number.

1861884885385 is a deficient number, since it is larger than the sum of its proper divisors (704787522551).

1861884885385 is a wasteful number, since it uses less digits than its factorization.

1861884885385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275630832.

The product of its digits is 471859200, while the sum is 73.

The spelling of 1861884885385 in words is "one trillion, eight hundred sixty-one billion, eight hundred eighty-four million, eight hundred eighty-five thousand, three hundred eighty-five".