6156781389 has 24 divisors (see below), whose sum is σ = 9963806112. Its totient is φ = 3630532320.

The previous prime is 6156781373. The next prime is 6156781399. The reversal of 6156781389 is 9831876516.

6156781389 is a `hidden beast` number, since 61 + 567 + 8 + 13 + 8 + 9 = 666.

It is not a de Polignac number, because 6156781389 - 2⁴ = 6156781373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6156781399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 836739 + ... + 844064.

It is an arithmetic number, because the mean of its divisors is an integer number (415158588).

Almost surely, 2^6156781389 is an apocalyptic number.

It is an amenable number.

6156781389 is a deficient number, since it is larger than the sum of its proper divisors (3807024723).

6156781389 is a wasteful number, since it uses less digits than its factorization.

6156781389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680857 (or 1680854 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The square root of 6156781389 is about 78465.1603515853. The cubic root of 6156781389 is about 1832.8119637856.

The spelling of 6156781389 in words is "six billion, one hundred fifty-six million, seven hundred eighty-one thousand, three hundred eighty-nine".