8156458639 has 16 divisors (see below), whose sum is σ = 9651521536. Its totient is φ = 6745226400.

The previous prime is 8156458619. The next prime is 8156458669. The reversal of 8156458639 is 9368546518.

It is a cyclic number.

It is not a de Polignac number, because 8156458639 - 2¹³ = 8156450447 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8156458639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8156458619) 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 15 ways as a sum of consecutive naturals, for example, 15049 + ... + 128605.

It is an arithmetic number, because the mean of its divisors is an integer number (603220096).

Almost surely, 2^8156458639 is an apocalyptic number.

8156458639 is a deficient number, since it is larger than the sum of its proper divisors (1495062897).

8156458639 is a wasteful number, since it uses less digits than its factorization.

8156458639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113926.

The product of its digits is 6220800, while the sum is 55.

The square root of 8156458639 is about 90313.1144352801. The cubic root of 8156458639 is about 2012.9541339709.

The spelling of 8156458639 in words is "eight billion, one hundred fifty-six million, four hundred fifty-eight thousand, six hundred thirty-nine".