61555061500 has 48 divisors (see below), whose sum is σ = 134460720576. Its totient is φ = 24617544000.

The previous prime is 61555061489. The next prime is 61555061531. The reversal of 61555061500 is 516055516.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4824129 + ... + 4836871.

It is an arithmetic number, because the mean of its divisors is an integer number (2801265012).

Almost surely, 2^61555061500 is an apocalyptic number.

It is an amenable number.

61555061500 is an abundant number, since it is smaller than the sum of its proper divisors (72905659076).

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

61555061500 is a wasteful number, since it uses less digits than its factorization.

61555061500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22423 (or 22411 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 34.

The spelling of 61555061500 in words is "sixty-one billion, five hundred fifty-five million, sixty-one thousand, five hundred".