81589214528 has 14 divisors (see below), whose sum is σ = 161903597706. Its totient is φ = 40794607232.

The previous prime is 81589214501. The next prime is 81589214549. The reversal of 81589214528 is 82541298518.

It can be written as a sum of positive squares in only one way, i.e., 60689307904 + 20899906624 = 246352^2 + 144568^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81589214528.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 637415675 + ... + 637415802.

Almost surely, 2^81589214528 is an apocalyptic number.

It is an amenable number.

81589214528 is a deficient number, since it is larger than the sum of its proper divisors (80314383178).

81589214528 is a wasteful number, since it uses less digits than its factorization.

81589214528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1274831489 (or 1274831479 counting only the distinct ones).

The product of its digits is 1843200, while the sum is 53.

The spelling of 81589214528 in words is "eighty-one billion, five hundred eighty-nine million, two hundred fourteen thousand, five hundred twenty-eight".