81314787635 has 8 divisors (see below), whose sum is σ = 102713416080. Its totient is φ = 61628049504.

The previous prime is 81314787551. The next prime is 81314787637. The reversal of 81314787635 is 53678741318.

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

It is a cyclic number.

It is not a de Polignac number, because 81314787635 - 2³⁰ = 80241045811 is a prime.

It is a super-2 number, since 2×81314787635² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81314787637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 427972472 + ... + 427972661.

It is an arithmetic number, because the mean of its divisors is an integer number (12839177010).

Almost surely, 2^81314787635 is an apocalyptic number.

81314787635 is a deficient number, since it is larger than the sum of its proper divisors (21398628445).

81314787635 is a wasteful number, since it uses less digits than its factorization.

81314787635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855945157.

The product of its digits is 3386880, while the sum is 53.

The spelling of 81314787635 in words is "eighty-one billion, three hundred fourteen million, seven hundred eighty-seven thousand, six hundred thirty-five".