6181881820 has 12 divisors (see below), whose sum is σ = 12981951864. Its totient is φ = 2472752720.

The previous prime is 6181881817. The next prime is 6181881829. The reversal of 6181881820 is 281881816.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6181881829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154547026 + ... + 154547065.

It is an arithmetic number, because the mean of its divisors is an integer number (1081829322).

Almost surely, 2^6181881820 is an apocalyptic number.

It is an amenable number.

6181881820 is an abundant number, since it is smaller than the sum of its proper divisors (6800070044).

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

6181881820 is a wasteful number, since it uses less digits than its factorization.

6181881820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309094100 (or 309094098 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 43.

The square root of 6181881820 is about 78624.9440063394. The cubic root of 6181881820 is about 1835.2993020292.

The spelling of 6181881820 in words is "six billion, one hundred eighty-one million, eight hundred eighty-one thousand, eight hundred twenty".