81965041190 has 8 divisors (see below), whose sum is σ = 147537074160. Its totient is φ = 32786016472.

The previous prime is 81965041181. The next prime is 81965041201. The reversal of 81965041190 is 9114056918.

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

It is a super-2 number, since 2×81965041190² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4098252050 + ... + 4098252069.

It is an arithmetic number, because the mean of its divisors is an integer number (18442134270).

Almost surely, 2^81965041190 is an apocalyptic number.

81965041190 is a deficient number, since it is larger than the sum of its proper divisors (65572032970).

81965041190 is a wasteful number, since it uses less digits than its factorization.

81965041190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8196504126.

The product of its (nonzero) digits is 77760, while the sum is 44.

The spelling of 81965041190 in words is "eighty-one billion, nine hundred sixty-five million, forty-one thousand, one hundred ninety".