1861679731548 has 768 divisors, whose sum is σ = 5999058616320. Its totient is φ = 435428130816.

The previous prime is 1861679731543. The next prime is 1861679731553. The reversal of 1861679731548 is 8451379761681.

It is an interprime number because it is at equal distance from previous prime (1861679731543) and next prime (1861679731553).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861679731543) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 4991098290 + ... + 4991098662.

It is an arithmetic number, because the mean of its divisors is an integer number (7811274240).

Almost surely, 2^{1861679731548} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1861679731548, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2999529308160).

1861679731548 is an abundant number, since it is smaller than the sum of its proper divisors (4137378884772).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1861679731548 is a wasteful number, since it uses less digits than its factorization.

1861679731548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646 (or 644 counting only the distinct ones).

The product of its digits is 60963840, while the sum is 66.

The spelling of 1861679731548 in words is "one trillion, eight hundred sixty-one billion, six hundred seventy-nine million, seven hundred thirty-one thousand, five hundred forty-eight".