61216555404 has 12 divisors (see below), whose sum is σ = 142838629304. Its totient is φ = 20405518464.

The previous prime is 61216555403. The next prime is 61216555451. The reversal of 61216555404 is 40455561216.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (61216555403) 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 3 ways as a sum of consecutive naturals, for example, 2550689797 + ... + 2550689820.

Almost surely, 2^61216555404 is an apocalyptic number.

It is an amenable number.

61216555404 is an abundant number, since it is smaller than the sum of its proper divisors (81622073900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61216555404 is a wasteful number, since it uses less digits than its factorization.

61216555404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5101379624 (or 5101379622 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 39.

The spelling of 61216555404 in words is "sixty-one billion, two hundred sixteen million, five hundred fifty-five thousand, four hundred four".