81067991015 has 8 divisors (see below), whose sum is σ = 106125370128. Its totient is φ = 58958538880.

The previous prime is 81067990987. The next prime is 81067991027. The reversal of 81067991015 is 51019976018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81067991015 - 2⁶ = 81067990951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 736981682 + ... + 736981791.

It is an arithmetic number, because the mean of its divisors is an integer number (13265671266).

Almost surely, 2^81067991015 is an apocalyptic number.

81067991015 is a deficient number, since it is larger than the sum of its proper divisors (25057379113).

81067991015 is a wasteful number, since it uses less digits than its factorization.

81067991015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1473963489.

The product of its (nonzero) digits is 136080, while the sum is 47.

The spelling of 81067991015 in words is "eighty-one billion, sixty-seven million, nine hundred ninety-one thousand, fifteen".