81858003697 has 8 divisors (see below), whose sum is σ = 85686509376. Its totient is φ = 78051953232.

The previous prime is 81858003671. The next prime is 81858003709. The reversal of 81858003697 is 79630085818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81858003697 - 2⁷ = 81858003569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81858003497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5606343 + ... + 5620924.

It is an arithmetic number, because the mean of its divisors is an integer number (10710813672).

Almost surely, 2^81858003697 is an apocalyptic number.

It is an amenable number.

81858003697 is a deficient number, since it is larger than the sum of its proper divisors (3828505679).

81858003697 is a wasteful number, since it uses less digits than its factorization.

81858003697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11227607.

The product of its (nonzero) digits is 2903040, while the sum is 55.

The spelling of 81858003697 in words is "eighty-one billion, eight hundred fifty-eight million, three thousand, six hundred ninety-seven".