81162739078 has 8 divisors (see below), whose sum is σ = 121754073168. Its totient is φ = 40578048024.

The previous prime is 81162738977. The next prime is 81162739079. The reversal of 81162739078 is 87093726118.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81162739079) 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, 1630101 + ... + 1679152.

It is an arithmetic number, because the mean of its divisors is an integer number (15219259146).

Almost surely, 2^81162739078 is an apocalyptic number.

81162739078 is a deficient number, since it is larger than the sum of its proper divisors (40591334090).

81162739078 is a wasteful number, since it uses less digits than its factorization.

81162739078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3321518.

The product of its (nonzero) digits is 1016064, while the sum is 52.

The spelling of 81162739078 in words is "eighty-one billion, one hundred sixty-two million, seven hundred thirty-nine thousand, seventy-eight".