61643225355 has 32 divisors (see below), whose sum is σ = 99366220800. Its totient is φ = 32631604992.

The previous prime is 61643225353. The next prime is 61643225363. The reversal of 61643225355 is 55352234616.

It is a happy number.

It is not a de Polignac number, because 61643225355 - 2¹ = 61643225353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61643225353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1072591 + ... + 1128599.

It is an arithmetic number, because the mean of its divisors is an integer number (3105194400).

Almost surely, 2^61643225355 is an apocalyptic number.

61643225355 is a deficient number, since it is larger than the sum of its proper divisors (37722995445).

61643225355 is a wasteful number, since it uses less digits than its factorization.

61643225355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56563.

The product of its digits is 648000, while the sum is 42.

The spelling of 61643225355 in words is "sixty-one billion, six hundred forty-three million, two hundred twenty-five thousand, three hundred fifty-five".