81949669102 has 8 divisors (see below), whose sum is σ = 140485147056. Its totient is φ = 35121286752.

The previous prime is 81949669037. The next prime is 81949669117. The reversal of 81949669102 is 20196694918.

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

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, 2926773883 + ... + 2926773910.

It is an arithmetic number, because the mean of its divisors is an integer number (17560643382).

Almost surely, 2^81949669102 is an apocalyptic number.

81949669102 is a deficient number, since it is larger than the sum of its proper divisors (58535477954).

81949669102 is a wasteful number, since it uses less digits than its factorization.

81949669102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5853547802.

The product of its (nonzero) digits is 1679616, while the sum is 55.

The spelling of 81949669102 in words is "eighty-one billion, nine hundred forty-nine million, six hundred sixty-nine thousand, one hundred two".