61244865529 has 9 divisors (see below), whose sum is σ = 62280690381. Its totient is φ = 60226002720.

The previous prime is 61244865527. The next prime is 61244865551. The reversal of 61244865529 is 92556844216.

The square root of 61244865529 is 247477.

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

It can be written as a sum of positive squares in 4 ways, for example, as 19034341225 + 42210524304 = 137965^2 + 205452^2 .

It is not a de Polignac number, because 61244865529 - 2¹ = 61244865527 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61244865527) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 15094069 + ... + 15098125.

It is an arithmetic number, because the mean of its divisors is an integer number (6920076709).

Almost surely, 2^61244865529 is an apocalyptic number.

61244865529 is the 247477-th square number.

61244865529 is the 123739-th centered octagonal number.

It is an amenable number.

61244865529 is a deficient number, since it is larger than the sum of its proper divisors (1035824852).

61244865529 is an frugal number, since it uses more digits than its factorization.

61244865529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8236 (or 4118 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 52.

The spelling of 61244865529 in words is "sixty-one billion, two hundred forty-four million, eight hundred sixty-five thousand, five hundred twenty-nine".