1861486406513 has 4 divisors (see below), whose sum is σ = 1861556306148. Its totient is φ = 1861416506880.

The previous prime is 1861486406447. The next prime is 1861486406531. The reversal of 1861486406513 is 3156046841681.

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 742435552609 + 1119050853904 = 861647^2 + 1057852^2 .

It is a cyclic number.

It is not a de Polignac number, because 1861486406513 - 2²⁰ = 1861485357937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1861486408513) 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, 34909856 + ... + 34963137.

It is an arithmetic number, because the mean of its divisors is an integer number (465389076537).

Almost surely, 2^{1861486406513} is an apocalyptic number.

It is an amenable number.

1861486406513 is a deficient number, since it is larger than the sum of its proper divisors (69899635).

1861486406513 is an equidigital number, since it uses as much as digits as its factorization.

1861486406513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69899634.

The product of its (nonzero) digits is 3317760, while the sum is 53.

The spelling of 1861486406513 in words is "one trillion, eight hundred sixty-one billion, four hundred eighty-six million, four hundred six thousand, five hundred thirteen".