61512650736 has 80 divisors (see below), whose sum is σ = 164104639488. Its totient is φ = 19834214400.

The previous prime is 61512650707. The next prime is 61512650737. The reversal of 61512650736 is 63705621516.

61512650736 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61512650737) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4056160 + ... + 4071296.

Almost surely, 2^61512650736 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 61512650736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82052319744).

61512650736 is an abundant number, since it is smaller than the sum of its proper divisors (102591988752).

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

61512650736 is a wasteful number, since it uses less digits than its factorization.

61512650736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17910 (or 17904 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 42.

The spelling of 61512650736 in words is "sixty-one billion, five hundred twelve million, six hundred fifty thousand, seven hundred thirty-six".