81658003 has 4 divisors (see below), whose sum is σ = 93323440. Its totient is φ = 69992568.

The previous prime is 81657977. The next prime is 81658007. The reversal of 81658003 is 30085618.

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

It is a cyclic number.

It is not a de Polignac number, because 81658003 - 2⁹ = 81657491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81658007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5832708 + ... + 5832721.

It is an arithmetic number, because the mean of its divisors is an integer number (23330860).

Almost surely, 2^81658003 is an apocalyptic number.

81658003 is a deficient number, since it is larger than the sum of its proper divisors (11665437).

81658003 is a wasteful number, since it uses less digits than its factorization.

81658003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11665436.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 81658003 is about 9036.4817821982. The cubic root of 81658003 is about 433.8433233574.

The spelling of 81658003 in words is "eighty-one million, six hundred fifty-eight thousand, three".