61055555 has 16 divisors (see below), whose sum is σ = 80110944. Its totient is φ = 44302080.

The previous prime is 61055539. The next prime is 61055567. The reversal of 61055555 is 55555016.

It is not a de Polignac number, because 61055555 - 2⁴ = 61055539 is a prime.

It is a Duffinian number.

61055555 is a modest number, since divided by 55555 gives 610 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29639 + ... + 31631.

It is an arithmetic number, because the mean of its divisors is an integer number (5006934).

Almost surely, 2^61055555 is an apocalyptic number.

61055555 is a deficient number, since it is larger than the sum of its proper divisors (19055389).

61055555 is a wasteful number, since it uses less digits than its factorization.

61055555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2566.

The product of its (nonzero) digits is 18750, while the sum is 32.

The square root of 61055555 is about 7813.8054109377. The cubic root of 61055555 is about 393.7691859300.

It can be divided in two parts, 610 and 55555, that added together give a palindrome (56165).

The spelling of 61055555 in words is "sixty-one million, fifty-five thousand, five hundred fifty-five".