1861124772240 has 480 divisors, whose sum is σ = 6680428425216. Its totient is φ = 481183856640.

The previous prime is 1861124772233. The next prime is 1861124772263. The reversal of 1861124772240 is 422774211681.

1861124772240 is a `hidden beast` number, since 1 + 8 + 6 + 112 + 477 + 22 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 210744625 + ... + 210753455.

Almost surely, 2^{1861124772240} is an apocalyptic number.

1861124772240 is a gapful number since it is divisible by the number (10) 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 1861124772240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3340214212608).

1861124772240 is an abundant number, since it is smaller than the sum of its proper divisors (4819303652976).

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

1861124772240 is a wasteful number, since it uses less digits than its factorization.

1861124772240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9189 (or 9171 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 45.

The spelling of 1861124772240 in words is "one trillion, eight hundred sixty-one billion, one hundred twenty-four million, seven hundred seventy-two thousand, two hundred forty".