660221163561631 has 8 divisors (see below), whose sum is σ = 767327260314240. Its totient is φ = 556312263727128.

The previous prime is 660221163561611. The next prime is 660221163561647. The reversal of 660221163561631 is 136165361122066.

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 660221163561631 - 2⁵ = 660221163561599 is a prime.

It is a super-2 number, since 2×660221163561631² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660221163561611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 799299229081 + ... + 799299229906.

It is an arithmetic number, because the mean of its divisors is an integer number (95915907539280).

Almost surely, 2^{660221163561631} is an apocalyptic number.

660221163561631 is a deficient number, since it is larger than the sum of its proper divisors (107106096752609).

660221163561631 is a wasteful number, since it uses less digits than its factorization.

660221163561631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1598598459053.

The product of its (nonzero) digits is 1399680, while the sum is 49.

The spelling of 660221163561631 in words is "six hundred sixty trillion, two hundred twenty-one billion, one hundred sixty-three million, five hundred sixty-one thousand, six hundred thirty-one".