665636054380 has 48 divisors (see below), whose sum is σ = 1525089275136. Its totient is φ = 242021286080.

The previous prime is 665636054353. The next prime is 665636054389. The reversal of 665636054380 is 83450636566.

It is not an unprimeable number, because it can be changed into a prime (665636054389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1765767 + ... + 2109313.

It is an arithmetic number, because the mean of its divisors is an integer number (31772693232).

Almost surely, 2^665636054380 is an apocalyptic number.

It is an amenable number.

665636054380 is an abundant number, since it is smaller than the sum of its proper divisors (859453220756).

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

665636054380 is a wasteful number, since it uses less digits than its factorization.

665636054380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352374 (or 352372 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 52.

The spelling of 665636054380 in words is "six hundred sixty-five billion, six hundred thirty-six million, fifty-four thousand, three hundred eighty".