661155241202602 has 16 divisors (see below), whose sum is σ = 992153957428872. Its totient is φ = 330437273518080.

The previous prime is 661155241202581. The next prime is 661155241202641. The reversal of 661155241202602 is 206202142551166.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 228618361457161 + 432536879745441 = 15120131^2 + 20797521^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68556202 + ... + 77603242.

Almost surely, 2^{661155241202602} is an apocalyptic number.

661155241202602 is a deficient number, since it is larger than the sum of its proper divisors (330998716226270).

661155241202602 is a wasteful number, since it uses less digits than its factorization.

661155241202602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9062553.

The product of its (nonzero) digits is 345600, while the sum is 43.

Adding to 661155241202602 its reverse (206202142551166), we get a palindrome (867357383753768).

The spelling of 661155241202602 in words is "six hundred sixty-one trillion, one hundred fifty-five billion, two hundred forty-one million, two hundred two thousand, six hundred two".