81000004715 has 32 divisors (see below), whose sum is σ = 112463683584. Its totient is φ = 54856258560.

The previous prime is 81000004639. The next prime is 81000004817. The reversal of 81000004715 is 51740000018.

It is not a de Polignac number, because 81000004715 - 2²⁰ = 80998956139 is a prime.

It is a super-3 number, since 3×81000004715³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 1628870 + ... + 1677860.

It is an arithmetic number, because the mean of its divisors is an integer number (3514490112).

Almost surely, 2^81000004715 is an apocalyptic number.

81000004715 is a deficient number, since it is larger than the sum of its proper divisors (31463678869).

81000004715 is a wasteful number, since it uses less digits than its factorization.

81000004715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49587.

The product of its (nonzero) digits is 1120, while the sum is 26.

The spelling of 81000004715 in words is "eighty-one billion, four thousand, seven hundred fifteen".