3781555656 has 16 divisors (see below), whose sum is σ = 9453889200. Its totient is φ = 1260518544.

The previous prime is 3781555651. The next prime is 3781555669. The reversal of 3781555656 is 6565551873.

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 = 3781555599 and 3781555608.

It is not an unprimeable number, because it can be changed into a prime (3781555651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78782386 + ... + 78782433.

It is an arithmetic number, because the mean of its divisors is an integer number (590868075).

Almost surely, 2^3781555656 is an apocalyptic number.

It is an amenable number.

3781555656 is an abundant number, since it is smaller than the sum of its proper divisors (5672333544).

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

3781555656 is a wasteful number, since it uses less digits than its factorization.

3781555656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157564828 (or 157564824 counting only the distinct ones).

The product of its digits is 3780000, while the sum is 51.

The square root of 3781555656 is about 61494.3546677254. The cubic root of 3781555656 is about 1557.9618979291.

The spelling of 3781555656 in words is "three billion, seven hundred eighty-one million, five hundred fifty-five thousand, six hundred fifty-six".