81015080000 has 70 divisors (see below), whose sum is σ = 200891167686. Its totient is φ = 32406016000.

The previous prime is 81015079973. The next prime is 81015080023. The reversal of 81015080000 is 8051018.

It can be written as a sum of positive squares in 5 ways, for example, as 24363463744 + 56651616256 = 156088^2 + 238016^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 972689 + ... + 1052688.

Almost surely, 2^81015080000 is an apocalyptic number.

81015080000 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81015080000 is an abundant number, since it is smaller than the sum of its proper divisors (119876087686).

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

81015080000 is an equidigital number, since it uses as much as digits as its factorization.

81015080000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2025409 (or 2025384 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 23.

The spelling of 81015080000 in words is "eighty-one billion, fifteen million, eighty thousand".