61431163560 has 128 divisors (see below), whose sum is σ = 220522176000. Its totient is φ = 15121513728.

The previous prime is 61431163537. The next prime is 61431163561. The reversal of 61431163560 is 6536113416.

61431163560 is a `hidden beast` number, since 6 + 1 + 4 + 3 + 11 + 635 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (61431163561) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 2173680 + ... + 2201759.

It is an arithmetic number, because the mean of its divisors is an integer number (1722829500).

Almost surely, 2^61431163560 is an apocalyptic number.

61431163560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61431163560 is an abundant number, since it is smaller than the sum of its proper divisors (159091012440).

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

61431163560 is a wasteful number, since it uses less digits than its factorization.

61431163560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4375472 (or 4375462 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

Adding to 61431163560 its reverse (6536113416), we get a palindrome (67967276976).

The spelling of 61431163560 in words is "sixty-one billion, four hundred thirty-one million, one hundred sixty-three thousand, five hundred sixty".