81702557896 has 16 divisors (see below), whose sum is σ = 153195381900. Its totient is φ = 40850456064.

The previous prime is 81702557879. The next prime is 81702557897. The reversal of 81702557896 is 69875520718.

It can be written as a sum of positive squares in 2 ways, for example, as 74100461796 + 7602096100 = 272214^2 + 87190^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81702557896.

It is not an unprimeable number, because it can be changed into a prime (81702557897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 608496 + ... + 730528.

Almost surely, 2^81702557896 is an apocalyptic number.

It is an amenable number.

81702557896 is a deficient number, since it is larger than the sum of its proper divisors (71492824004).

81702557896 is a wasteful number, since it uses less digits than its factorization.

81702557896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205728 (or 205724 counting only the distinct ones).

The product of its (nonzero) digits is 8467200, while the sum is 58.

The spelling of 81702557896 in words is "eighty-one billion, seven hundred two million, five hundred fifty-seven thousand, eight hundred ninety-six".