61561002050020 has 48 divisors (see below), whose sum is σ = 141033115944000. Its totient is φ = 22385428974720.

The previous prime is 61561002050003. The next prime is 61561002050069. The reversal of 61561002050020 is 2005020016516.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10373626 + ... + 15189934.

It is an arithmetic number, because the mean of its divisors is an integer number (2938189915500).

Almost surely, 2^{61561002050020} is an apocalyptic number.

It is an amenable number.

61561002050020 is an abundant number, since it is smaller than the sum of its proper divisors (79472113893980).

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

61561002050020 is a wasteful number, since it uses less digits than its factorization.

61561002050020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4874428 (or 4874426 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 61561002050020 its reverse (2005020016516), we get a palindrome (63566022066536).

The spelling of 61561002050020 in words is "sixty-one trillion, five hundred sixty-one billion, two million, fifty thousand, twenty".