665155238202 has 144 divisors (see below), whose sum is σ = 1839487595400. Its totient is φ = 172115483904.

The previous prime is 665155238201. The next prime is 665155238203. The reversal of 665155238202 is 202832551566.

665155238202 is a `hidden beast` number, since 6 + 6 + 515 + 52 + 3 + 82 + 0 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (665155238201) and next prime (665155238203).

It can be written as a sum of positive squares in 4 ways, for example, as 317903141241 + 347252096961 = 563829^2 + 589281^2 .

It is not an unprimeable number, because it can be changed into a prime (665155238201) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 60424 + ... + 1154972.

Almost surely, 2^665155238202 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665155238202, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (919743797700).

665155238202 is an abundant number, since it is smaller than the sum of its proper divisors (1174332357198).

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

665155238202 is a wasteful number, since it uses less digits than its factorization.

665155238202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1094637 (or 1094627 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 45.

Adding to 665155238202 its reverse (202832551566), we get a palindrome (867987789768).

The spelling of 665155238202 in words is "six hundred sixty-five billion, one hundred fifty-five million, two hundred thirty-eight thousand, two hundred two".