61336314640 has 20 divisors (see below), whose sum is σ = 142606931724. Its totient is φ = 24534525824.

The previous prime is 61336314631. The next prime is 61336314659. The reversal of 61336314640 is 4641363316.

It can be written as a sum of positive squares in 2 ways, for example, as 15284871424 + 46051443216 = 123632^2 + 214596^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 61336314640.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 383351887 + ... + 383352046.

Almost surely, 2^61336314640 is an apocalyptic number.

It is an amenable number.

61336314640 is an abundant number, since it is smaller than the sum of its proper divisors (81270617084).

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

61336314640 is a wasteful number, since it uses less digits than its factorization.

61336314640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766703946 (or 766703940 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 37.

Adding to 61336314640 its reverse (4641363316), we get a palindrome (65977677956).

The spelling of 61336314640 in words is "sixty-one billion, three hundred thirty-six million, three hundred fourteen thousand, six hundred forty".