81588567868 has 24 divisors (see below), whose sum is σ = 148207610880. Its totient is φ = 39253139520.

The previous prime is 81588567833. The next prime is 81588567871. The reversal of 81588567868 is 86876588518.

It is a junction number, because it is equal to n+sod(n) for n = 81588567797 and 81588567806.

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, 1166268 + ... + 1234243.

It is an arithmetic number, because the mean of its divisors is an integer number (6175317120).

Almost surely, 2^81588567868 is an apocalyptic number.

It is an amenable number.

81588567868 is a deficient number, since it is larger than the sum of its proper divisors (66619043012).

81588567868 is a wasteful number, since it uses less digits than its factorization.

81588567868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2400837 (or 2400835 counting only the distinct ones).

The product of its digits is 206438400, while the sum is 70.

The spelling of 81588567868 in words is "eighty-one billion, five hundred eighty-eight million, five hundred sixty-seven thousand, eight hundred sixty-eight".