81958786003 has 8 divisors (see below), whose sum is σ = 86782431888. Its totient is φ = 77135422464.

The previous prime is 81958786001. The next prime is 81958786009. The reversal of 81958786003 is 30068785918.

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

It is not a de Polignac number, because 81958786003 - 2¹ = 81958786001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81958786001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 943075 + ... + 1026307.

It is an arithmetic number, because the mean of its divisors is an integer number (10847803986).

Almost surely, 2^81958786003 is an apocalyptic number.

81958786003 is a deficient number, since it is larger than the sum of its proper divisors (4823645885).

81958786003 is a wasteful number, since it uses less digits than its factorization.

81958786003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141173.

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

The spelling of 81958786003 in words is "eighty-one billion, nine hundred fifty-eight million, seven hundred eighty-six thousand, three".