81258063364 has 9 divisors (see below), whose sum is σ = 142202608597. Its totient is φ = 40628746624.

The previous prime is 81258063361. The next prime is 81258063389. The reversal of 81258063364 is 46336085218.

The square root of 81258063364 is 285058.

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., 80348437764 + 909625600 = 283458^2 + 30160^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81258063361) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 498852 + ... + 641380.

Almost surely, 2^81258063364 is an apocalyptic number.

81258063364 is the 285058-th square number.

It is an amenable number.

81258063364 is a deficient number, since it is larger than the sum of its proper divisors (60944545233).

81258063364 is an frugal number, since it uses more digits than its factorization.

81258063364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285062 (or 142531 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 46.

The spelling of 81258063364 in words is "eighty-one billion, two hundred fifty-eight million, sixty-three thousand, three hundred sixty-four".