61531321160 has 64 divisors (see below), whose sum is σ = 150551259120. Its totient is φ = 22538649600.

The previous prime is 61531321141. The next prime is 61531321169. The reversal of 61531321160 is 6112313516.

61531321160 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 58688938564 + 2842382596 = 242258^2 + 53314^2 .

It is a super-2 number, since 2×61531321160² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61531321169) 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, 1197641 + ... + 1247960.

Almost surely, 2^61531321160 is an apocalyptic number.

It is an amenable number.

61531321160 is an abundant number, since it is smaller than the sum of its proper divisors (89019937960).

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

61531321160 is a wasteful number, since it uses less digits than its factorization.

61531321160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2445666 (or 2445662 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 29.

Adding to 61531321160 its reverse (6112313516), we get a palindrome (67643634676).

The spelling of 61531321160 in words is "sixty-one billion, five hundred thirty-one million, three hundred twenty-one thousand, one hundred sixty".