81948803654 has 8 divisors (see below), whose sum is σ = 130153982328. Its totient is φ = 38564142880.

The previous prime is 81948803627. The next prime is 81948803663. The reversal of 81948803654 is 45630884918.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 81948803654.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1205129432 + ... + 1205129499.

It is an arithmetic number, because the mean of its divisors is an integer number (16269247791).

Almost surely, 2^81948803654 is an apocalyptic number.

81948803654 is a deficient number, since it is larger than the sum of its proper divisors (48205178674).

81948803654 is a wasteful number, since it uses less digits than its factorization.

81948803654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2410258950.

The product of its (nonzero) digits is 6635520, while the sum is 56.

The spelling of 81948803654 in words is "eighty-one billion, nine hundred forty-eight million, eight hundred three thousand, six hundred fifty-four".