61661356106 has 16 divisors (see below), whose sum is σ = 108562079616. Its totient is φ = 25712071056.

The previous prime is 61661356073. The next prime is 61661356151. The reversal of 61661356106 is 60165316616.

It is a super-3 number, since 3×61661356106³ (a number of 33 digits) contains 333 as substring.

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 7 ways as a sum of consecutive naturals, for example, 59518166 + ... + 59519201.

It is an arithmetic number, because the mean of its divisors is an integer number (6785129976).

Almost surely, 2^61661356106 is an apocalyptic number.

61661356106 is a deficient number, since it is larger than the sum of its proper divisors (46900723510).

61661356106 is a wasteful number, since it uses less digits than its factorization.

61661356106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119037413.

The product of its (nonzero) digits is 116640, while the sum is 41.

The spelling of 61661356106 in words is "sixty-one billion, six hundred sixty-one million, three hundred fifty-six thousand, one hundred six".