61012017155 has 16 divisors (see below), whose sum is σ = 74622461760. Its totient is φ = 47871577728.

The previous prime is 61012017151. The next prime is 61012017163. The reversal of 61012017155 is 55171021016.

It is a cyclic number.

It is not a de Polignac number, because 61012017155 - 2² = 61012017151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61012017151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 729641 + ... + 808949.

It is an arithmetic number, because the mean of its divisors is an integer number (4663903860).

Almost surely, 2^61012017155 is an apocalyptic number.

61012017155 is a deficient number, since it is larger than the sum of its proper divisors (13610444605).

61012017155 is a wasteful number, since it uses less digits than its factorization.

61012017155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82270.

The product of its (nonzero) digits is 2100, while the sum is 29.

The spelling of 61012017155 in words is "sixty-one billion, twelve million, seventeen thousand, one hundred fifty-five".