81527809634954 has 16 divisors (see below), whose sum is σ = 122318402887680. Its totient is φ = 40755009047040.

The previous prime is 81527809634939. The next prime is 81527809634977. The reversal of 81527809634954 is 45943690872518.

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 7 ways as a sum of consecutive naturals, for example, 744892874 + ... + 745002314.

It is an arithmetic number, because the mean of its divisors is an integer number (7644900180480).

It is a 1-persistent number, because it is pandigital, but 2⋅81527809634954 = 163055619269908 is not.

Almost surely, 2^{81527809634954} is an apocalyptic number.

81527809634954 is a deficient number, since it is larger than the sum of its proper divisors (40790593252726).

81527809634954 is a wasteful number, since it uses less digits than its factorization.

81527809634954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187325.

The product of its (nonzero) digits is 522547200, while the sum is 71.

The spelling of 81527809634954 in words is "eighty-one trillion, five hundred twenty-seven billion, eight hundred nine million, six hundred thirty-four thousand, nine hundred fifty-four".