61005555550 has 24 divisors (see below), whose sum is σ = 116109182376. Its totient is φ = 23834727840.

The previous prime is 61005555503. The next prime is 61005555641. The reversal of 61005555550 is 5555550016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14185189 + ... + 14189488.

It is an arithmetic number, because the mean of its divisors is an integer number (4837882599).

Almost surely, 2^61005555550 is an apocalyptic number.

61005555550 is a deficient number, since it is larger than the sum of its proper divisors (55103626826).

61005555550 is a wasteful number, since it uses less digits than its factorization.

61005555550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28374732 (or 28374727 counting only the distinct ones).

The product of its (nonzero) digits is 93750, while the sum is 37.

The spelling of 61005555550 in words is "sixty-one billion, five million, five hundred fifty-five thousand, five hundred fifty".