601500061661 has 4 divisors (see below), whose sum is σ = 615488435232.
Its totient is φ = 587511688092.
The previous prime is 601500061609. The next prime is 601500061697. The reversal of 601500061661 is 166160005106.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is a cyclic number.
It is not a de Polignac number, because 601500061661 - 238 = 326622154717 is a prime.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (601500061361) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6994186721 + ... + 6994186806.
It is an arithmetic number, because the mean of its divisors is an integer number (153872108808).
Almost surely, 2601500061661 is an apocalyptic number.
It is an amenable number.
601500061661 is a deficient number, since it is larger than the sum of its proper divisors (13988373571).
601500061661 is a wasteful number, since it uses less digits than its factorization.
601500061661 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 13988373570.
The product of its (nonzero) digits is 6480, while the sum is 32.
Adding to 601500061661 its reverse (166160005106), we get a palindrome (767660066767).
The spelling of 601500061661 in words is "six hundred one billion, five hundred million, sixty-one thousand, six hundred sixty-one".