61505055 has 48 divisors (see below), whose sum is σ = 112260960. Its totient is φ = 31943808.

The previous prime is 61505053. The next prime is 61505057. The reversal of 61505055 is 55050516.

61505055 is a `hidden beast` number, since 6 + 150 + 505 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (61505053) and next prime (61505057).

It is not a de Polignac number, because 61505055 - 2¹ = 61505053 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61505053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 778506 + ... + 778584.

It is an arithmetic number, because the mean of its divisors is an integer number (2338770).

Almost surely, 2^61505055 is an apocalyptic number.

61505055 is a deficient number, since it is larger than the sum of its proper divisors (50755905).

61505055 is an equidigital number, since it uses as much as digits as its factorization.

61505055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245 (or 160 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The square root of 61505055 is about 7842.5158590850. The cubic root of 61505055 is about 394.7331531024.

The spelling of 61505055 in words is "sixty-one million, five hundred five thousand, fifty-five".