661477345358592 has 288 divisors, whose sum is σ = 2035224507423744. Its totient is φ = 186823872921600.

The previous prime is 661477345358549. The next prime is 661477345358593. The reversal of 661477345358592 is 295853543774166.

It is not an unprimeable number, because it can be changed into a prime (661477345358593) 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, 160465042 + ... + 164535662.

It is an arithmetic number, because the mean of its divisors is an integer number (7066751761888).

Almost surely, 2^{661477345358592} 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 661477345358592, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1017612253711872).

661477345358592 is an abundant number, since it is smaller than the sum of its proper divisors (1373747162065152).

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

661477345358592 is a wasteful number, since it uses less digits than its factorization.

661477345358592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4070995 (or 4070981 counting only the distinct ones).

The product of its digits is 4572288000, while the sum is 75.

The spelling of 661477345358592 in words is "six hundred sixty-one trillion, four hundred seventy-seven billion, three hundred forty-five million, three hundred fifty-eight thousand, five hundred ninety-two".