61265215544 has 64 divisors (see below), whose sum is σ = 126392663040. Its totient is φ = 27668874240.

The previous prime is 61265215523. The next prime is 61265215573. The reversal of 61265215544 is 44551256216.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 932414 + ... + 995954.

It is an arithmetic number, because the mean of its divisors is an integer number (1974885360).

Almost surely, 2^61265215544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61265215544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63196331520).

61265215544 is an abundant number, since it is smaller than the sum of its proper divisors (65127447496).

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

61265215544 is a wasteful number, since it uses less digits than its factorization.

61265215544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63760 (or 63756 counting only the distinct ones).

The product of its digits is 288000, while the sum is 41.

The spelling of 61265215544 in words is "sixty-one billion, two hundred sixty-five million, two hundred fifteen thousand, five hundred forty-four".