81511451130 has 64 divisors (see below), whose sum is σ = 196071840000. Its totient is φ = 21687085056.

The previous prime is 81511451111. The next prime is 81511451179. The reversal of 81511451130 is 3115411518.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36831904 + ... + 36834116.

It is an arithmetic number, because the mean of its divisors is an integer number (3063622500).

Almost surely, 2^81511451130 is an apocalyptic number.

81511451130 is an abundant number, since it is smaller than the sum of its proper divisors (114560388870).

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

81511451130 is a wasteful number, since it uses less digits than its factorization.

81511451130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4455.

The product of its (nonzero) digits is 2400, while the sum is 30.

Adding to 81511451130 its reverse (3115411518), we get a palindrome (84626862648).

The spelling of 81511451130 in words is "eighty-one billion, five hundred eleven million, four hundred fifty-one thousand, one hundred thirty".