61555666655516 has 24 divisors (see below), whose sum is σ = 117520460959104. Its totient is φ = 27978634826480.

The previous prime is 61555666655501. The next prime is 61555666655519.

It is a happy number.

61555666655516 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61555666655519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29315030 + ... + 31344573.

It is an arithmetic number, because the mean of its divisors is an integer number (4896685873296).

Almost surely, 2^{61555666655516} is an apocalyptic number.

It is an amenable number.

61555666655516 is a deficient number, since it is larger than the sum of its proper divisors (55964794303588).

61555666655516 is a wasteful number, since it uses less digits than its factorization.

61555666655516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60682681 (or 60682679 counting only the distinct ones).

The product of its digits is 729000000, while the sum is 68.

The spelling of 61555666655516 in words is "sixty-one trillion, five hundred fifty-five billion, six hundred sixty-six million, six hundred fifty-five thousand, five hundred sixteen".