61432120520 has 32 divisors (see below), whose sum is σ = 138245512320. Its totient is φ = 24568716480.

The previous prime is 61432120487. The next prime is 61432120531. The reversal of 61432120520 is 2502123416.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 61432120520.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117569 + ... + 369711.

It is an arithmetic number, because the mean of its divisors is an integer number (4320172260).

Almost surely, 2^61432120520 is an apocalyptic number.

It is an amenable number.

61432120520 is an abundant number, since it is smaller than the sum of its proper divisors (76813391800).

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

61432120520 is a wasteful number, since it uses less digits than its factorization.

61432120520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258245 (or 258241 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 61432120520 its reverse (2502123416), we get a palindrome (63934243936).

The spelling of 61432120520 in words is "sixty-one billion, four hundred thirty-two million, one hundred twenty thousand, five hundred twenty".