61515566560 has 96 divisors (see below), whose sum is σ = 170581118400. Its totient is φ = 20521009152.

The previous prime is 61515566537. The next prime is 61515566569. The reversal of 61515566560 is 6566551516.

It is a self number, because there is not a number n which added to its sum of digits gives 61515566560.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61515566569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 700785 + ... + 783664.

It is an arithmetic number, because the mean of its divisors is an integer number (1776886650).

Almost surely, 2^61515566560 is an apocalyptic number.

It is an amenable number.

61515566560 is an abundant number, since it is smaller than the sum of its proper divisors (109065551840).

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

61515566560 is a wasteful number, since it uses less digits than its factorization.

61515566560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1484508 (or 1484500 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 46.

The spelling of 61515566560 in words is "sixty-one billion, five hundred fifteen million, five hundred sixty-six thousand, five hundred sixty".