8081546639 has 4 divisors (see below), whose sum is σ = 8432918256. Its totient is φ = 7730175024.

The previous prime is 8081546617. The next prime is 8081546677. The reversal of 8081546639 is 9366451808.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8081546639 - 2²⁴ = 8064769423 is a prime.

It is a super-2 number, since 2×8081546639² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8081546839) 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 3 ways as a sum of consecutive naturals, for example, 175685774 + ... + 175685819.

It is an arithmetic number, because the mean of its divisors is an integer number (2108229564).

Almost surely, 2^8081546639 is an apocalyptic number.

8081546639 is a deficient number, since it is larger than the sum of its proper divisors (351371617).

8081546639 is a wasteful number, since it uses less digits than its factorization.

8081546639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351371616.

The product of its (nonzero) digits is 1244160, while the sum is 50.

The square root of 8081546639 is about 89897.4228718488. The cubic root of 8081546639 is about 2006.7725933525.

The spelling of 8081546639 in words is "eight billion, eighty-one million, five hundred forty-six thousand, six hundred thirty-nine".