61335436640 has 48 divisors (see below), whose sum is σ = 146011163760. Its totient is φ = 24346882560.

The previous prime is 61335436627. The next prime is 61335436697. The reversal of 61335436640 is 4663453316.

It is a happy number.

61335436640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1442195 + ... + 1484114.

It is an arithmetic number, because the mean of its divisors is an integer number (3041899245).

Almost surely, 2^61335436640 is an apocalyptic number.

It is an amenable number.

61335436640 is an abundant number, since it is smaller than the sum of its proper divisors (84675727120).

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

61335436640 is a wasteful number, since it uses less digits than its factorization.

61335436640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2926455 (or 2926447 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 41.

Adding to 61335436640 its reverse (4663453316), we get a palindrome (65998889956).

The spelling of 61335436640 in words is "sixty-one billion, three hundred thirty-five million, four hundred thirty-six thousand, six hundred forty".