81954654063 has 8 divisors (see below), whose sum is σ = 109434282288. Its totient is φ = 54555730944.

The previous prime is 81954654043. The next prime is 81954654143. The reversal of 81954654063 is 36045645918.

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

It is not a de Polignac number, because 81954654063 - 2¹⁴ = 81954637679 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81954653997 and 81954654015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81954654043) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 20173906 + ... + 20177967.

It is an arithmetic number, because the mean of its divisors is an integer number (13679285286).

Almost surely, 2^81954654063 is an apocalyptic number.

81954654063 is a deficient number, since it is larger than the sum of its proper divisors (27479628225).

81954654063 is a wasteful number, since it uses less digits than its factorization.

81954654063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40352553.

The product of its (nonzero) digits is 3110400, while the sum is 51.

The spelling of 81954654063 in words is "eighty-one billion, nine hundred fifty-four million, six hundred fifty-four thousand, sixty-three".