661362100201 has 24 divisors (see below), whose sum is σ = 769940277120.
Its totient is φ = 565704670080.
The previous prime is 661362100187. The next prime is 661362100211. The reversal of 661362100201 is 102001263166.
It is not a de Polignac number, because 661362100201 - 211 = 661362098153 is a prime.
It is a Duffinian number.
It is a self number, because there is not a number n which added to its sum of digits gives 661362100201.
It is not an unprimeable number, because it can be changed into a prime (661362100211) by changing a digit.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7209460 + ... + 7300618.
It is an arithmetic number, because the mean of its divisors is an integer number (32080844880).
Almost surely, 2661362100201 is an apocalyptic number.
It is an amenable number.
661362100201 is a deficient number, since it is larger than the sum of its proper divisors (108578176919).
661362100201 is a wasteful number, since it uses less digits than its factorization.
661362100201 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 94725 (or 94714 counting only the distinct ones).
The product of its (nonzero) digits is 2592, while the sum is 28.
Adding to 661362100201 its reverse (102001263166), we get a palindrome (763363363367).
The spelling of 661362100201 in words is "six hundred sixty-one billion, three hundred sixty-two million, one hundred thousand, two hundred one".