81525152440384 has 21 divisors (see below), whose sum is σ = 161776617711421. Its totient is φ = 40762540103680.

The previous prime is 81525152440367. The next prime is 81525152440559. The reversal of 81525152440384 is 48304425152518.

The square root of 81525152440384 is 9029128.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 80075151134784 + 1450001305600 = 8948472^2 + 1204160^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 71668704 + ... + 72797344.

Almost surely, 2^{81525152440384} is an apocalyptic number.

81525152440384 is the 9029128-th square number.

It is an amenable number.

81525152440384 is a deficient number, since it is larger than the sum of its proper divisors (80251465271037).

81525152440384 is an frugal number, since it uses more digits than its factorization.

81525152440384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2257294 (or 1128643 counting only the distinct ones).

The product of its (nonzero) digits is 6144000, while the sum is 52.

The spelling of 81525152440384 in words is "eighty-one trillion, five hundred twenty-five billion, one hundred fifty-two million, four hundred forty thousand, three hundred eighty-four".