61556155 has 16 divisors (see below), whose sum is σ = 75487104. Its totient is φ = 48176640.

The previous prime is 61556153. The next prime is 61556191. The reversal of 61556155 is 55165516.

It is not a de Polignac number, because 61556155 - 2¹ = 61556153 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61556155.

It is not an unprimeable number, because it can be changed into a prime (61556153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49390 + ... + 50620.

It is an arithmetic number, because the mean of its divisors is an integer number (4717944).

Almost surely, 2^61556155 is an apocalyptic number.

61556155 is a deficient number, since it is larger than the sum of its proper divisors (13930949).

61556155 is a wasteful number, since it uses less digits than its factorization.

61556155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1446.

The product of its digits is 22500, while the sum is 34.

The square root of 61556155 is about 7845.7730657979. The cubic root of 61556155 is about 394.8424410329.

The spelling of 61556155 in words is "sixty-one million, five hundred fifty-six thousand, one hundred fifty-five".