61560155 has 4 divisors (see below), whose sum is σ = 73872192. Its totient is φ = 49248120.

The previous prime is 61560151. The next prime is 61560199. The reversal of 61560155 is 55106516.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 61560155 - 2² = 61560151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61560151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6156011 + ... + 6156020.

It is an arithmetic number, because the mean of its divisors is an integer number (18468048).

Almost surely, 2^61560155 is an apocalyptic number.

61560155 is a deficient number, since it is larger than the sum of its proper divisors (12312037).

61560155 is a wasteful number, since it uses less digits than its factorization.

61560155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12312036.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 61560155 is about 7846.0279759889. The cubic root of 61560155 is about 394.8509933083.

The spelling of 61560155 in words is "sixty-one million, five hundred sixty thousand, one hundred fifty-five".