661155241202611 has 8 divisors (see below), whose sum is σ = 678954214540800. Its totient is φ = 643592015855880.

The previous prime is 661155241202581. The next prime is 661155241202641. The reversal of 661155241202611 is 116202142551166.

It is an interprime number because it is at equal distance from previous prime (661155241202581) and next prime (661155241202641).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 661155241202611 - 2⁷ = 661155241202483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661155241202641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58936992181 + ... + 58937003398.

It is an arithmetic number, because the mean of its divisors is an integer number (84869276817600).

Almost surely, 2^{661155241202611} is an apocalyptic number.

661155241202611 is a deficient number, since it is larger than the sum of its proper divisors (17798973338189).

661155241202611 is a wasteful number, since it uses less digits than its factorization.

661155241202611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117873995729.

The product of its (nonzero) digits is 172800, while the sum is 43.

Adding to 661155241202611 its reverse (116202142551166), we get a palindrome (777357383753777).

The spelling of 661155241202611 in words is "six hundred sixty-one trillion, one hundred fifty-five billion, two hundred forty-one million, two hundred two thousand, six hundred eleven".