81954649510673 has 8 divisors (see below), whose sum is σ = 82766371060800. Its totient is φ = 81142933634800.

The previous prime is 81954649510639. The next prime is 81954649510687. The reversal of 81954649510673 is 37601594645918.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81954649510673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81954649510633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31338278 + ... + 33852576.

It is an arithmetic number, because the mean of its divisors is an integer number (10345796382600).

Almost surely, 2^{81954649510673} is an apocalyptic number.

It is an amenable number.

81954649510673 is a deficient number, since it is larger than the sum of its proper divisors (811721550127).

81954649510673 is a wasteful number, since it uses less digits than its factorization.

81954649510673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2837127.

The product of its (nonzero) digits is 195955200, while the sum is 68.

The spelling of 81954649510673 in words is "eighty-one trillion, nine hundred fifty-four billion, six hundred forty-nine million, five hundred ten thousand, six hundred seventy-three".