81508141814 has 8 divisors (see below), whose sum is σ = 133376959368. Its totient is φ = 37049155360.

The previous prime is 81508141777. The next prime is 81508141831. The reversal of 81508141814 is 41814180518.

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

It is a super-2 number, since 2×81508141814² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1852457747 + ... + 1852457790.

It is an arithmetic number, because the mean of its divisors is an integer number (16672119921).

Almost surely, 2^81508141814 is an apocalyptic number.

81508141814 is a deficient number, since it is larger than the sum of its proper divisors (51868817554).

81508141814 is a wasteful number, since it uses less digits than its factorization.

81508141814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3704915550.

The product of its (nonzero) digits is 40960, while the sum is 41.

It can be divided in two parts, 81508 and 141814, that added together give a palindrome (223322).

The spelling of 81508141814 in words is "eighty-one billion, five hundred eight million, one hundred forty-one thousand, eight hundred fourteen".