81626117120 has 88 divisors (see below), whose sum is σ = 195905170944. Its totient is φ = 32634085376.

The previous prime is 81626117063. The next prime is 81626117129. The reversal of 81626117120 is 2171162618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81626117129) 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, 19776497 + ... + 19780623.

Almost surely, 2^81626117120 is an apocalyptic number.

81626117120 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81626117120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97952585472).

81626117120 is an abundant number, since it is smaller than the sum of its proper divisors (114279053824).

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

81626117120 is a wasteful number, since it uses less digits than its factorization.

81626117120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8015 (or 7997 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 35.

Adding to 81626117120 its reverse (2171162618), we get a palindrome (83797279738).

The spelling of 81626117120 in words is "eighty-one billion, six hundred twenty-six million, one hundred seventeen thousand, one hundred twenty".