61555655516 has 24 divisors (see below), whose sum is σ = 108215439360. Its totient is φ = 30637060272.

The previous prime is 61555655503. The next prime is 61555655543.

61555655516 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×61555655516² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2748821 + ... + 2771123.

It is an arithmetic number, because the mean of its divisors is an integer number (4508976640).

Almost surely, 2^61555655516 is an apocalyptic number.

It is an amenable number.

61555655516 is a deficient number, since it is larger than the sum of its proper divisors (46659783844).

61555655516 is a wasteful number, since it uses less digits than its factorization.

61555655516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25433 (or 25431 counting only the distinct ones).

The product of its digits is 3375000, while the sum is 50.

The spelling of 61555655516 in words is "sixty-one billion, five hundred fifty-five million, six hundred fifty-five thousand, five hundred sixteen".