61477218916 has 9 divisors (see below), whose sum is σ = 107586000921. Its totient is φ = 30738361512.

The previous prime is 61477218911. The next prime is 61477218923. The reversal of 61477218916 is 61981277416.

It is a happy number.

The square root of 61477218916 is 247946.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 42572068900 + 18905150016 = 206330^2 + 137496^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61477218911) by changing a digit.

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 2 ways as a sum of consecutive naturals, for example, 433906 + ... + 557878.

Almost surely, 2^61477218916 is an apocalyptic number.

61477218916 is the 247946-th square number.

It is an amenable number.

61477218916 is a deficient number, since it is larger than the sum of its proper divisors (46108782005).

61477218916 is an frugal number, since it uses more digits than its factorization.

61477218916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247950 (or 123975 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 52.

The spelling of 61477218916 in words is "sixty-one billion, four hundred seventy-seven million, two hundred eighteen thousand, nine hundred sixteen".