81000045000007 has 4 divisors (see below), whose sum is σ = 92571480000016. Its totient is φ = 69428610000000.

The previous prime is 81000045000001. The next prime is 81000045000031. The reversal of 81000045000007 is 70000054000018.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81000045000007 is a prime.

It is a super-2 number, since 2×81000045000007² (a number of 29 digits) contains 22 as substring.

It is the 9000003-rd Hogben number.

It is a Duffinian number.

It is a congruent number.

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

It is a nontrivial repunit in base 9000002.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5785717499994 + ... + 5785717500007.

It is an arithmetic number, because the mean of its divisors is an integer number (23142870000004).

Almost surely, 2^{81000045000007} is an apocalyptic number.

81000045000007 is a deficient number, since it is larger than the sum of its proper divisors (11571435000009).

81000045000007 is a wasteful number, since it uses less digits than its factorization.

81000045000007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11571435000008.

The product of its (nonzero) digits is 1120, while the sum is 25.

The spelling of 81000045000007 in words is "eighty-one trillion, forty-five million, seven", and thus it is an aban number and an uban number.