61312355312 has 80 divisors (see below), whose sum is σ = 136138161600. Its totient is φ = 26499280896.

The previous prime is 61312355287. The next prime is 61312355339. The reversal of 61312355312 is 21355321316.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 660098 + ... + 747230.

It is an arithmetic number, because the mean of its divisors is an integer number (1701727020).

Almost surely, 2^61312355312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61312355312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68069080800).

61312355312 is an abundant number, since it is smaller than the sum of its proper divisors (74825806288).

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

61312355312 is a wasteful number, since it uses less digits than its factorization.

61312355312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87370 (or 87364 counting only the distinct ones).

The product of its digits is 16200, while the sum is 32.

Adding to 61312355312 its reverse (21355321316), we get a palindrome (82667676628).

The spelling of 61312355312 in words is "sixty-one billion, three hundred twelve million, three hundred fifty-five thousand, three hundred twelve".