81598894652 has 48 divisors (see below), whose sum is σ = 161616712320. Its totient is φ = 35708030400.

The previous prime is 81598894651. The next prime is 81598894687. The reversal of 81598894652 is 25649889518.

It is a super-2 number, since 2×81598894652² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81598894651) 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, 350627 + ... + 534917.

It is an arithmetic number, because the mean of its divisors is an integer number (3367014840).

Almost surely, 2^81598894652 is an apocalyptic number.

It is an amenable number.

81598894652 is a deficient number, since it is larger than the sum of its proper divisors (80017817668).

81598894652 is a wasteful number, since it uses less digits than its factorization.

81598894652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184682 (or 184680 counting only the distinct ones).

The product of its digits is 49766400, while the sum is 65.

The spelling of 81598894652 in words is "eighty-one billion, five hundred ninety-eight million, eight hundred ninety-four thousand, six hundred fifty-two".