61220413155 has 32 divisors (see below), whose sum is σ = 108873642240. Its totient is φ = 29122570880.

The previous prime is 61220413123. The next prime is 61220413213. The reversal of 61220413155 is 55131402216.

It is not a de Polignac number, because 61220413155 - 2⁵ = 61220413123 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3491565 + ... + 3509054.

It is an arithmetic number, because the mean of its divisors is an integer number (3402301320).

Almost surely, 2^61220413155 is an apocalyptic number.

61220413155 is a deficient number, since it is larger than the sum of its proper divisors (47653229085).

61220413155 is a wasteful number, since it uses less digits than its factorization.

61220413155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7000691.

The product of its (nonzero) digits is 7200, while the sum is 30.

The spelling of 61220413155 in words is "sixty-one billion, two hundred twenty million, four hundred thirteen thousand, one hundred fifty-five".