81062500080 has 80 divisors (see below), whose sum is σ = 251456718240. Its totient is φ = 21602648064.

The previous prime is 81062500039. The next prime is 81062500117. The reversal of 81062500080 is 8000526018.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×81062500080² (a number of 23 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 263976 + ... + 481464.

It is an arithmetic number, because the mean of its divisors is an integer number (3143208978).

Almost surely, 2^81062500080 is an apocalyptic number.

81062500080 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81062500080 is an abundant number, since it is smaller than the sum of its proper divisors (170394218160).

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

81062500080 is a wasteful number, since it uses less digits than its factorization.

81062500080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219058 (or 219052 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The spelling of 81062500080 in words is "eighty-one billion, sixty-two million, five hundred thousand, eighty".