61515372005540 has 48 divisors (see below), whose sum is σ = 130372464222000. Its totient is φ = 24379464678912.

The previous prime is 61515372005491. The next prime is 61515372005569. The reversal of 61515372005540 is 4550027351516.

It can be written as a sum of positive squares in 8 ways, for example, as 22458196824064 + 39057175181476 = 4739008^2 + 6249574^2 .

It is a junction number, because it is equal to n+sod(n) for n = 61515372005491 and 61515372005500.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57450986 + ... + 58511934.

It is an arithmetic number, because the mean of its divisors is an integer number (2716093004625).

Almost surely, 2^{61515372005540} is an apocalyptic number.

It is an amenable number.

61515372005540 is an abundant number, since it is smaller than the sum of its proper divisors (68857092216460).

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

61515372005540 is a wasteful number, since it uses less digits than its factorization.

61515372005540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1087664 (or 1087662 counting only the distinct ones).

The product of its (nonzero) digits is 630000, while the sum is 44.

The spelling of 61515372005540 in words is "sixty-one trillion, five hundred fifteen billion, three hundred seventy-two million, five thousand, five hundred forty".