61605155 has 8 divisors (see below), whose sum is σ = 77140512. Its totient is φ = 47141248.

The previous prime is 61605113. The next prime is 61605169. The reversal of 61605155 is 55150616.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61605155 - 2⁸ = 61604899 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 267734 + ... + 267963.

It is an arithmetic number, because the mean of its divisors is an integer number (9642564).

Almost surely, 2^61605155 is an apocalyptic number.

61605155 is a deficient number, since it is larger than the sum of its proper divisors (15535357).

61605155 is a wasteful number, since it uses less digits than its factorization.

61605155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535725.

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

The square root of 61605155 is about 7848.8951451781. The cubic root of 61605155 is about 394.9471808880.

The spelling of 61605155 in words is "sixty-one million, six hundred five thousand, one hundred fifty-five".