61340336440 has 64 divisors (see below), whose sum is σ = 145520179200. Its totient is φ = 23206290048.

The previous prime is 61340336429. The next prime is 61340336501. The reversal of 61340336440 is 4463304316.

It is a junction number, because it is equal to n+sod(n) for n = 61340336396 and 61340336405.

It is a congruent number.

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, 394837 + ... + 527803.

It is an arithmetic number, because the mean of its divisors is an integer number (2273752800).

Almost surely, 2^61340336440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61340336440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72760089600).

61340336440 is an abundant number, since it is smaller than the sum of its proper divisors (84179842760).

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

61340336440 is a wasteful number, since it uses less digits than its factorization.

61340336440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133604 (or 133600 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 34.

The spelling of 61340336440 in words is "sixty-one billion, three hundred forty million, three hundred thirty-six thousand, four hundred forty".