1861237665487 has 8 divisors (see below), whose sum is σ = 1863855391104. Its totient is φ = 1858621008768.

The previous prime is 1861237665467. The next prime is 1861237665499. The reversal of 1861237665487 is 7845667321681.

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

It is a cyclic number.

It is not a de Polignac number, because 1861237665487 - 2¹⁵ = 1861237632719 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 (1861237665467) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3250243 + ... + 3779755.

It is an arithmetic number, because the mean of its divisors is an integer number (232981923888).

Almost surely, 2^{1861237665487} is an apocalyptic number.

1861237665487 is a deficient number, since it is larger than the sum of its proper divisors (2617725617).

1861237665487 is an equidigital number, since it uses as much as digits as its factorization.

1861237665487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534449.

The product of its digits is 81285120, while the sum is 64.

The spelling of 1861237665487 in words is "one trillion, eight hundred sixty-one billion, two hundred thirty-seven million, six hundred sixty-five thousand, four hundred eighty-seven".