81367074938 has 8 divisors (see below), whose sum is σ = 122060901888. Its totient is φ = 40680107644.

The previous prime is 81367074871. The next prime is 81367074947. The reversal of 81367074938 is 83947076318.

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

It is a super-2 number, since 2×81367074938² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

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, 1685156 + ... + 1732767.

It is an arithmetic number, because the mean of its divisors is an integer number (15257612736).

Almost surely, 2^81367074938 is an apocalyptic number.

81367074938 is a deficient number, since it is larger than the sum of its proper divisors (40693826950).

81367074938 is a wasteful number, since it uses less digits than its factorization.

81367074938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3429828.

The product of its (nonzero) digits is 6096384, while the sum is 56.

The spelling of 81367074938 in words is "eighty-one billion, three hundred sixty-seven million, seventy-four thousand, nine hundred thirty-eight".