61445550574540 has 96 divisors (see below), whose sum is σ = 141560109250560. Its totient is φ = 22217827852800.

The previous prime is 61445550574493. The next prime is 61445550574547. The reversal of 61445550574540 is 4547505554416.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is not an unprimeable number, because it can be changed into a prime (61445550574547) 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, 1130296960 + ... + 1130351320.

It is an arithmetic number, because the mean of its divisors is an integer number (1474584471360).

Almost surely, 2^{61445550574540} 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 61445550574540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70780054625280).

61445550574540 is an abundant number, since it is smaller than the sum of its proper divisors (80114558676020).

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

61445550574540 is a wasteful number, since it uses less digits than its factorization.

61445550574540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83263 (or 83261 counting only the distinct ones).

The product of its (nonzero) digits is 33600000, while the sum is 55.

The spelling of 61445550574540 in words is "sixty-one trillion, four hundred forty-five billion, five hundred fifty million, five hundred seventy-four thousand, five hundred forty".