61506055554 has 16 divisors (see below), whose sum is σ = 123198783840. Its totient is φ = 20470906400.

The previous prime is 61506055549. The next prime is 61506055627. The reversal of 61506055554 is 45555060516.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 7773747 + ... + 7781654.

It is an arithmetic number, because the mean of its divisors is an integer number (7699923990).

Almost surely, 2^61506055554 is an apocalyptic number.

61506055554 is an abundant number, since it is smaller than the sum of its proper divisors (61692728286).

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

61506055554 is a wasteful number, since it uses less digits than its factorization.

61506055554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15556065.

The product of its (nonzero) digits is 450000, while the sum is 42.

The spelling of 61506055554 in words is "sixty-one billion, five hundred six million, fifty-five thousand, five hundred fifty-four".