61647504020440 has 128 divisors (see below), whose sum is σ = 157341854073600. Its totient is φ = 21549982901760.

The previous prime is 61647504020413. The next prime is 61647504020449. The reversal of 61647504020440 is 4402040574616.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61647504020449) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12998775 + ... + 17095705.

It is an arithmetic number, because the mean of its divisors is an integer number (1229233234950).

Almost surely, 2^{61647504020440} 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 61647504020440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78670927036800).

61647504020440 is an abundant number, since it is smaller than the sum of its proper divisors (95694350053160).

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

61647504020440 is a wasteful number, since it uses less digits than its factorization.

61647504020440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4098497 (or 4098493 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 43.

The spelling of 61647504020440 in words is "sixty-one trillion, six hundred forty-seven billion, five hundred four million, twenty thousand, four hundred forty".