81523555532518 has 16 divisors (see below), whose sum is σ = 133434506179584. Its totient is φ = 37047182605960.

The previous prime is 81523555532477. The next prime is 81523555532521.

81523555532518 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 448857130 + ... + 449038717.

It is an arithmetic number, because the mean of its divisors is an integer number (8339656636224).

Almost surely, 2^{81523555532518} is an apocalyptic number.

81523555532518 is a deficient number, since it is larger than the sum of its proper divisors (51910950647066).

81523555532518 is a wasteful number, since it uses less digits than its factorization.

81523555532518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897899987.

The product of its digits is 36000000, while the sum is 58.

The spelling of 81523555532518 in words is "eighty-one trillion, five hundred twenty-three billion, five hundred fifty-five million, five hundred thirty-two thousand, five hundred eighteen".