81516016336 has 10 divisors (see below), whose sum is σ = 157937281682. Its totient is φ = 40758008160.

The previous prime is 81516016313. The next prime is 81516016343. The reversal of 81516016336 is 63361061518.

It can be written as a sum of positive squares in only one way, i.e., 79041948736 + 2474067600 = 281144^2 + 49740^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2547375495 + ... + 2547375526.

Almost surely, 2^81516016336 is an apocalyptic number.

It is an amenable number.

81516016336 is a deficient number, since it is larger than the sum of its proper divisors (76421265346).

81516016336 is a wasteful number, since it uses less digits than its factorization.

81516016336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5094751029 (or 5094751023 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 40.

The spelling of 81516016336 in words is "eighty-one billion, five hundred sixteen million, sixteen thousand, three hundred thirty-six".