82661041405 has 8 divisors (see below), whose sum is σ = 99323600184. Its totient is φ = 66041932800.

The previous prime is 82661041399. The next prime is 82661041427. The reversal of 82661041405 is 50414016628.

It can be written as a sum of positive squares in 4 ways, for example, as 1608090201 + 81052951204 = 40101^2 + 284698^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 82661041405 - 2²⁷ = 82526823677 is a prime.

It is a Duffinian number.

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, 10858356 + ... + 10865965.

It is an arithmetic number, because the mean of its divisors is an integer number (12415450023).

Almost surely, 2^82661041405 is an apocalyptic number.

It is an amenable number.

82661041405 is a deficient number, since it is larger than the sum of its proper divisors (16662558779).

82661041405 is a wasteful number, since it uses less digits than its factorization.

82661041405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21725087.

The product of its (nonzero) digits is 46080, while the sum is 37.

The spelling of 82661041405 in words is "eighty-two billion, six hundred sixty-one million, forty-one thousand, four hundred five".