61616510550 has 72 divisors (see below), whose sum is σ = 189192038256. Its totient is φ = 14083773120.

The previous prime is 61616510539. The next prime is 61616510609. The reversal of 61616510550 is 5501561616.

It is a super-2 number, since 2×61616510550² (a number of 22 digits) contains 22 as substring.

It is a congruent 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 35 ways as a sum of consecutive naturals, for example, 9777249 + ... + 9783548.

It is an arithmetic number, because the mean of its divisors is an integer number (2627667198).

Almost surely, 2^61616510550 is an apocalyptic number.

61616510550 is an abundant number, since it is smaller than the sum of its proper divisors (127575527706).

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

61616510550 is a wasteful number, since it uses less digits than its factorization.

61616510550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19560822 (or 19560814 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 61616510550 in words is "sixty-one billion, six hundred sixteen million, five hundred ten thousand, five hundred fifty".