81699682428789 has 16 divisors (see below), whose sum is σ = 111468580608000. Its totient is φ = 53198672947056.

The previous prime is 81699682428751. The next prime is 81699682428803. The reversal of 81699682428789 is 98782428699618.

It is not a de Polignac number, because 81699682428789 - 2¹⁹ = 81699681904501 is a prime.

It is a super-4 number, since 4×81699682428789⁴ (a number of 57 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81699682427789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 496389 + ... + 12792410.

It is an arithmetic number, because the mean of its divisors is an integer number (6966786288000).

Almost surely, 2^{81699682428789} is an apocalyptic number.

It is an amenable number.

81699682428789 is a deficient number, since it is larger than the sum of its proper divisors (29768898179211).

81699682428789 is a wasteful number, since it uses less digits than its factorization.

81699682428789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13336504.

The product of its digits is 12039487488, while the sum is 87.

The spelling of 81699682428789 in words is "eighty-one trillion, six hundred ninety-nine billion, six hundred eighty-two million, four hundred twenty-eight thousand, seven hundred eighty-nine".