1863820756836 has 36 divisors (see below), whose sum is σ = 4988461439052. Its totient is φ = 584728080384.

The previous prime is 1863820756813. The next prime is 1863820756843. The reversal of 1863820756836 is 6386570283681.

It is a happy number.

1863820756836 is a `hidden beast` number, since 1 + 8 + 6 + 38 + 2 + 0 + 7 + 568 + 36 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1569492806436 + 294327950400 = 1252794^2 + 542520^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1863820756836² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1522728765 + ... + 1522729988.

It is an arithmetic number, because the mean of its divisors is an integer number (138568373307).

Almost surely, 2^{1863820756836} is an apocalyptic number.

It is an amenable number.

1863820756836 is an abundant number, since it is smaller than the sum of its proper divisors (3124640682216).

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

1863820756836 is a wasteful number, since it uses less digits than its factorization.

1863820756836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3045458780 (or 3045458775 counting only the distinct ones).

The product of its (nonzero) digits is 69672960, while the sum is 63.

The spelling of 1863820756836 in words is "one trillion, eight hundred sixty-three billion, eight hundred twenty million, seven hundred fifty-six thousand, eight hundred thirty-six".