61656155 has 24 divisors (see below), whose sum is σ = 81868416. Its totient is φ = 44542080.

The previous prime is 61656149. The next prime is 61656163. The reversal of 61656155 is 55165616.

It is not a de Polignac number, because 61656155 - 2⁴ = 61656139 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 134687 + ... + 135143.

It is an arithmetic number, because the mean of its divisors is an integer number (3411184).

Almost surely, 2^61656155 is an apocalyptic number.

61656155 is a deficient number, since it is larger than the sum of its proper divisors (20212261).

61656155 is a wasteful number, since it uses less digits than its factorization.

61656155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707 (or 696 counting only the distinct ones).

The product of its digits is 27000, while the sum is 35.

The square root of 61656155 is about 7852.1433379683. The cubic root of 61656155 is about 395.0561368701.

It can be divided in two parts, 616561 and 55, that added together give a palindrome (616616).

The spelling of 61656155 in words is "sixty-one million, six hundred fifty-six thousand, one hundred fifty-five".