1861840236816 has 400 divisors, whose sum is σ = 6281105554944. Its totient is φ = 521386564608.

The previous prime is 1861840236769. The next prime is 1861840236821. The reversal of 1861840236816 is 6186320481681.

1861840236816 is a `hidden beast` number, since 1 + 8 + 618 + 4 + 0 + 2 + 3 + 6 + 8 + 16 = 666.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 902490601 + ... + 902492663.

Almost surely, 2^{1861840236816} is an apocalyptic number.

1861840236816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1861840236816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3140552777472).

1861840236816 is an abundant number, since it is smaller than the sum of its proper divisors (4419265318128).

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

1861840236816 is a wasteful number, since it uses less digits than its factorization.

1861840236816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4020 (or 4005 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 54.

The spelling of 1861840236816 in words is "one trillion, eight hundred sixty-one billion, eight hundred forty million, two hundred thirty-six thousand, eight hundred sixteen".