61537109712 has 80 divisors (see below), whose sum is σ = 180209924160. Its totient is φ = 17937939456.

The previous prime is 61537109657. The next prime is 61537109719. The reversal of 61537109712 is 21790173516.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61537109719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2583333 + ... + 2607044.

It is an arithmetic number, because the mean of its divisors is an integer number (2252624052).

Almost surely, 2^61537109712 is an apocalyptic number.

It is an amenable number.

61537109712 is an abundant number, since it is smaller than the sum of its proper divisors (118672814448).

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

61537109712 is a wasteful number, since it uses less digits than its factorization.

61537109712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5190420 (or 5190414 counting only the distinct ones).

The product of its (nonzero) digits is 79380, while the sum is 42.

The spelling of 61537109712 in words is "sixty-one billion, five hundred thirty-seven million, one hundred nine thousand, seven hundred twelve".