81702594421 has 8 divisors (see below), whose sum is σ = 93651471680. Its totient is φ = 69822986688.

The previous prime is 81702594419. The next prime is 81702594427. The reversal of 81702594421 is 12449520718.

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

It is not a de Polignac number, because 81702594421 - 2¹ = 81702594419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81702594427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17314851 + ... + 17319568.

It is an arithmetic number, because the mean of its divisors is an integer number (11706433960).

Almost surely, 2^81702594421 is an apocalyptic number.

It is an amenable number.

81702594421 is a deficient number, since it is larger than the sum of its proper divisors (11948877259).

81702594421 is a wasteful number, since it uses less digits than its factorization.

81702594421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34634763.

The product of its (nonzero) digits is 161280, while the sum is 43.

The spelling of 81702594421 in words is "eighty-one billion, seven hundred two million, five hundred ninety-four thousand, four hundred twenty-one".