81634387481654 has 64 divisors (see below), whose sum is σ = 143101668777984. Its totient is φ = 34201791426816.

The previous prime is 81634387481587. The next prime is 81634387481681. The reversal of 81634387481654 is 45618478343618.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 553368467 + ... + 553515969.

It is an arithmetic number, because the mean of its divisors is an integer number (2235963574656).

Almost surely, 2^{81634387481654} is an apocalyptic number.

81634387481654 is a deficient number, since it is larger than the sum of its proper divisors (61467281296330).

81634387481654 is a wasteful number, since it uses less digits than its factorization.

81634387481654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150261.

The product of its digits is 371589120, while the sum is 68.

The spelling of 81634387481654 in words is "eighty-one trillion, six hundred thirty-four billion, three hundred eighty-seven million, four hundred eighty-one thousand, six hundred fifty-four".