61212733912 has 64 divisors (see below), whose sum is σ = 129580365600. Its totient is φ = 26853120000.

The previous prime is 61212733891. The next prime is 61212733913. The reversal of 61212733912 is 21933721216.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61212733913) 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 15 ways as a sum of consecutive naturals, for example, 9441712 + ... + 9448192.

Almost surely, 2^61212733912 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 61212733912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64790182800).

61212733912 is an abundant number, since it is smaller than the sum of its proper divisors (68367631688).

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

61212733912 is a wasteful number, since it uses less digits than its factorization.

61212733912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10228 (or 10224 counting only the distinct ones).

The product of its digits is 27216, while the sum is 37.

The spelling of 61212733912 in words is "sixty-one billion, two hundred twelve million, seven hundred thirty-three thousand, nine hundred twelve".