61215851216 has 20 divisors (see below), whose sum is σ = 127729228452. Its totient is φ = 28253469696.

The previous prime is 61215851197. The next prime is 61215851231.

61215851216 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 5329000000 + 55886851216 = 73000^2 + 236404^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 61215851216.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 147153281 + ... + 147153696.

Almost surely, 2^61215851216 is an apocalyptic number.

It is an amenable number.

61215851216 is an abundant number, since it is smaller than the sum of its proper divisors (66513377236).

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

61215851216 is a wasteful number, since it uses less digits than its factorization.

61215851216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294306998 (or 294306992 counting only the distinct ones).

The product of its digits is 28800, while the sum is 38.

The spelling of 61215851216 in words is "sixty-one billion, two hundred fifteen million, eight hundred fifty-one thousand, two hundred sixteen".