81038470715 has 4 divisors (see below), whose sum is σ = 97246164864. Its totient is φ = 64830776568.

The previous prime is 81038470699. The next prime is 81038470763. The reversal of 81038470715 is 51707483018.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51707483018 = 2 ⋅25853741509.

It is a cyclic number.

It is not a de Polignac number, because 81038470715 - 2⁴ = 81038470699 is a prime.

It is a super-2 number, since 2×81038470715² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8103847067 + ... + 8103847076.

It is an arithmetic number, because the mean of its divisors is an integer number (24311541216).

Almost surely, 2^81038470715 is an apocalyptic number.

81038470715 is a deficient number, since it is larger than the sum of its proper divisors (16207694149).

81038470715 is a wasteful number, since it uses less digits than its factorization.

81038470715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16207694148.

The product of its (nonzero) digits is 188160, while the sum is 44.

The spelling of 81038470715 in words is "eighty-one billion, thirty-eight million, four hundred seventy thousand, seven hundred fifteen".