61564526884 has 81 divisors (see below), whose sum is σ = 129076039953. Its totient is φ = 25618100256.

The previous prime is 61564526867. The next prime is 61564526917. The reversal of 61564526884 is 48862546516.

The square root of 61564526884 is 248122.

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., 55088784100 + 6475742784 = 234710^2 + 80472^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 128526957 + ... + 128527435.

Almost surely, 2^61564526884 is an apocalyptic number.

61564526884 is the 248122-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61564526884

61564526884 is an abundant number, since it is smaller than the sum of its proper divisors (67511513069).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61564526884 is an equidigital number, since it uses as much as digits as its factorization.

61564526884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050 (or 525 counting only the distinct ones).

The product of its digits is 11059200, while the sum is 55.

The spelling of 61564526884 in words is "sixty-one billion, five hundred sixty-four million, five hundred twenty-six thousand, eight hundred eighty-four".