61555155 has 16 divisors (see below), whose sum is σ = 103672320. Its totient is φ = 31101408.

The previous prime is 61555127. The next prime is 61555163. The reversal of 61555155 is 55155516.

It is not a de Polignac number, because 61555155 - 2⁷ = 61555027 is a prime.

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, 107707 + ... + 108276.

It is an arithmetic number, because the mean of its divisors is an integer number (6479520).

Almost surely, 2^61555155 is an apocalyptic number.

61555155 is a deficient number, since it is larger than the sum of its proper divisors (42117165).

61555155 is a wasteful number, since it uses less digits than its factorization.

61555155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216010.

The product of its digits is 18750, while the sum is 33.

The square root of 61555155 is about 7845.7093369561. The cubic root of 61555155 is about 394.8403029062.

The spelling of 61555155 in words is "sixty-one million, five hundred fifty-five thousand, one hundred fifty-five".