81648265082 has 4 divisors (see below), whose sum is σ = 122472397626. Its totient is φ = 40824132540.

The previous prime is 81648265067. The next prime is 81648265099. The reversal of 81648265082 is 28056284618.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 48071001001 + 33577264081 = 219251^2 + 183241^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81648265082.

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 as a sum of consecutive naturals, namely, 20412066269 + ... + 20412066272.

Almost surely, 2^81648265082 is an apocalyptic number.

81648265082 is a deficient number, since it is larger than the sum of its proper divisors (40824132544).

81648265082 is a wasteful number, since it uses less digits than its factorization.

81648265082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40824132543.

The product of its (nonzero) digits is 1474560, while the sum is 50.

The spelling of 81648265082 in words is "eighty-one billion, six hundred forty-eight million, two hundred sixty-five thousand, eighty-two".