81658703 has 4 divisors (see below), whose sum is σ = 93324240. Its totient is φ = 69993168.

The previous prime is 81658697. The next prime is 81658711. The reversal of 81658703 is 30785618.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30785618 = 2 ⋅15392809.

It is not a de Polignac number, because 81658703 - 2¹² = 81654607 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81658723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5832758 + ... + 5832771.

It is an arithmetic number, because the mean of its divisors is an integer number (23331060).

Almost surely, 2^81658703 is an apocalyptic number.

81658703 is a deficient number, since it is larger than the sum of its proper divisors (11665537).

81658703 is a wasteful number, since it uses less digits than its factorization.

81658703 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11665536.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 81658703 is about 9036.5205140032. The cubic root of 81658703 is about 433.8445630377.

The spelling of 81658703 in words is "eighty-one million, six hundred fifty-eight thousand, seven hundred three".