61534550140 has 96 divisors (see below), whose sum is σ = 156434955264. Its totient is φ = 19848299520.

The previous prime is 61534550101. The next prime is 61534550141. The reversal of 61534550140 is 4105543516.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 61534550096 and 61534550105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61534550141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8733459 + ... + 8740501.

It is an arithmetic number, because the mean of its divisors is an integer number (1629530784).

Almost surely, 2^61534550140 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 61534550140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78217477632).

61534550140 is an abundant number, since it is smaller than the sum of its proper divisors (94900405124).

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

61534550140 is a wasteful number, since it uses less digits than its factorization.

61534550140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10747 (or 10745 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 34.

The spelling of 61534550140 in words is "sixty-one billion, five hundred thirty-four million, five hundred fifty thousand, one hundred forty".