61216813072 has 20 divisors (see below), whose sum is σ = 120108939520. Its totient is φ = 30220957728.

The previous prime is 61216812977. The next prime is 61216813079. The reversal of 61216813072 is 27031861216.

It is not an unprimeable number, because it can be changed into a prime (61216813079) 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, 24214248 + ... + 24216775.

It is an arithmetic number, because the mean of its divisors is an integer number (6005446976).

Almost surely, 2^61216813072 is an apocalyptic number.

It is an amenable number.

61216813072 is a deficient number, since it is larger than the sum of its proper divisors (58892126448).

61216813072 is a wasteful number, since it uses less digits than its factorization.

61216813072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48431110 (or 48431104 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The spelling of 61216813072 in words is "sixty-one billion, two hundred sixteen million, eight hundred thirteen thousand, seventy-two".