81000045000008 has 8 divisors (see below), whose sum is σ = 151875084375030. Its totient is φ = 40500022500000.

The previous prime is 81000045000001. The next prime is 81000045000031. The reversal of 81000045000008 is 80000054000018.

It can be written as a sum of positive squares in only one way, i.e., 45583049316484 + 35416995683524 = 6751522^2 + 5951218^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×81000045000008² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81000045000001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5062502812493 + ... + 5062502812508.

Almost surely, 2^{81000045000008} is an apocalyptic number.

It is an amenable number.

81000045000008 is a deficient number, since it is larger than the sum of its proper divisors (70875039375022).

81000045000008 is a wasteful number, since it uses less digits than its factorization.

81000045000008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10125005625007 (or 10125005625003 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 26.

The spelling of 81000045000008 in words is "eighty-one trillion, forty-five million, eight", and thus it is an aban number and an uban number.