3781718556 has 48 divisors (see below), whose sum is σ = 11001365760. Its totient is φ = 982264320.

The previous prime is 3781718539. The next prime is 3781718573. The reversal of 3781718556 is 6558171873.

It is an interprime number because it is at equal distance from previous prime (3781718539) and next prime (3781718573).

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 3781718499 and 3781718508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2045461 + ... + 2047308.

It is an arithmetic number, because the mean of its divisors is an integer number (229195120).

Almost surely, 2^3781718556 is an apocalyptic number.

It is an amenable number.

3781718556 is an abundant number, since it is smaller than the sum of its proper divisors (7219647204).

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

3781718556 is a wasteful number, since it uses less digits than its factorization.

3781718556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4092794 (or 4092792 counting only the distinct ones).

The product of its digits is 1411200, while the sum is 51.

The square root of 3781718556 is about 61495.6791652877. The cubic root of 3781718556 is about 1557.9842686474.

The spelling of 3781718556 in words is "three billion, seven hundred eighty-one million, seven hundred eighteen thousand, five hundred fifty-six".