81849661003 has 16 divisors (see below), whose sum is σ = 91212480000. Its totient is φ = 72807935200.

The previous prime is 81849660961. The next prime is 81849661013. The reversal of 81849661003 is 30016694818.

It is a de Polignac number, because none of the positive numbers 2^k-81849661003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81849661013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2408373 + ... + 2442121.

It is an arithmetic number, because the mean of its divisors is an integer number (5700780000).

Almost surely, 2^81849661003 is an apocalyptic number.

81849661003 is a deficient number, since it is larger than the sum of its proper divisors (9362818997).

81849661003 is a wasteful number, since it uses less digits than its factorization.

81849661003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38498.

The product of its (nonzero) digits is 248832, while the sum is 46.

The spelling of 81849661003 in words is "eighty-one billion, eight hundred forty-nine million, six hundred sixty-one thousand, three".