61315043540 has 12 divisors (see below), whose sum is σ = 128761591476. Its totient is φ = 24526017408.

The previous prime is 61315043527. The next prime is 61315043549. The reversal of 61315043540 is 4534051316.

It can be written as a sum of positive squares in 2 ways, for example, as 37201922884 + 24113120656 = 192878^2 + 155284^2 .

It is a junction number, because it is equal to n+sod(n) for n = 61315043497 and 61315043506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61315043549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1532876069 + ... + 1532876108.

It is an arithmetic number, because the mean of its divisors is an integer number (10730132623).

Almost surely, 2^61315043540 is an apocalyptic number.

It is an amenable number.

61315043540 is an abundant number, since it is smaller than the sum of its proper divisors (67446547936).

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

61315043540 is a wasteful number, since it uses less digits than its factorization.

61315043540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3065752186 (or 3065752184 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

Adding to 61315043540 its reverse (4534051316), we get a palindrome (65849094856).

The spelling of 61315043540 in words is "sixty-one billion, three hundred fifteen million, forty-three thousand, five hundred forty".