81726103518 has 32 divisors (see below), whose sum is σ = 177288199200. Its totient is φ = 25014205440.

The previous prime is 81726103517. The next prime is 81726103519. The reversal of 81726103518 is 81530162718.

It is an interprime number because it is at equal distance from previous prime (81726103517) and next prime (81726103519).

It is a super-4 number, since 4×81726103518⁴ (a number of 45 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81726103518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81726103517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9766993 + ... + 9775356.

It is an arithmetic number, because the mean of its divisors is an integer number (5540256225).

Almost surely, 2^81726103518 is an apocalyptic number.

81726103518 is an abundant number, since it is smaller than the sum of its proper divisors (95562095682).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81726103518 is a wasteful number, since it uses less digits than its factorization.

81726103518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19542412.

The product of its (nonzero) digits is 80640, while the sum is 42.

The spelling of 81726103518 in words is "eighty-one billion, seven hundred twenty-six million, one hundred three thousand, five hundred eighteen".