1861725683730 has 128 divisors (see below), whose sum is σ = 5047161580800. Its totient is φ = 435354393600.

The previous prime is 1861725683683. The next prime is 1861725683737. The reversal of 1861725683730 is 373865271681.

It is a super-3 number, since 3×1861725683730³ (a number of 38 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1861725683737) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10139340 + ... + 10321320.

It is an arithmetic number, because the mean of its divisors is an integer number (39430949850).

Almost surely, 2^{1861725683730} is an apocalyptic number.

1861725683730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1861725683730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2523580790400).

1861725683730 is an abundant number, since it is smaller than the sum of its proper divisors (3185435897070).

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

1861725683730 is a wasteful number, since it uses less digits than its factorization.

1861725683730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183100.

The product of its (nonzero) digits is 10160640, while the sum is 57.

The spelling of 1861725683730 in words is "one trillion, eight hundred sixty-one billion, seven hundred twenty-five million, six hundred eighty-three thousand, seven hundred thirty".