665200097604 has 135 divisors (see below), whose sum is σ = 2023189574637. Its totient is φ = 190027809216.

The previous prime is 665200097593. The next prime is 665200097609. The reversal of 665200097604 is 406790002566.

The square root of 665200097604 is 815598.

It is a perfect power (a square), and thus also a powerful number.

665200097604 is a `hidden beast` number, since 66 + 520 + 0 + 0 + 9 + 7 + 60 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 122255122500 + 542944975104 = 349650^2 + 736848^2 .

It is a super-2 number, since 2×665200097604² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 665200097604.

It is not an unprimeable number, because it can be changed into a prime (665200097609) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 102762112 + ... + 102768584.

Almost surely, 2^665200097604 is an apocalyptic number.

665200097604 is the 815598-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665200097604

665200097604 is an abundant number, since it is smaller than the sum of its proper divisors (1357989477033).

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

665200097604 is an frugal number, since it uses more digits than its factorization.

665200097604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12976 (or 6485 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

It can be divided in two parts, 6652000 and 97604, that added together give a square (6749604 = 2598²).

The spelling of 665200097604 in words is "six hundred sixty-five billion, two hundred million, ninety-seven thousand, six hundred four".