81802619216 has 10 divisors (see below), whose sum is σ = 158492574762. Its totient is φ = 40901309600.

The previous prime is 81802619207. The next prime is 81802619221. The reversal of 81802619216 is 61291620818.

It can be written as a sum of positive squares in only one way, i.e., 74441665600 + 7360953616 = 272840^2 + 85796^2 .

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, 2556331835 + ... + 2556331866.

Almost surely, 2^81802619216 is an apocalyptic number.

It is an amenable number.

81802619216 is a deficient number, since it is larger than the sum of its proper divisors (76689955546).

81802619216 is a wasteful number, since it uses less digits than its factorization.

81802619216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5112663709 (or 5112663703 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 44.

The spelling of 81802619216 in words is "eighty-one billion, eight hundred two million, six hundred nineteen thousand, two hundred sixteen".