661107601 has 16 divisors (see below), whose sum is σ = 846518400. Its totient is φ = 501223680.

The previous prime is 661107599. The next prime is 661107619. The reversal of 661107601 is 106701166.

It is a cyclic number.

It is not a de Polignac number, because 661107601 - 2¹ = 661107599 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 661107601.

It is not an unprimeable number, because it can be changed into a prime (661107661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113176 + ... + 118873.

It is an arithmetic number, because the mean of its divisors is an integer number (52907400).

Almost surely, 2^661107601 is an apocalyptic number.

It is an amenable number.

661107601 is a deficient number, since it is larger than the sum of its proper divisors (185410799).

661107601 is a wasteful number, since it uses less digits than its factorization.

661107601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232104.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 661107601 is about 25712.0127761325. The cubic root of 661107601 is about 871.1455386011.

Adding to 661107601 its reverse (106701166), we get a palindrome (767808767).

The spelling of 661107601 in words is "six hundred sixty-one million, one hundred seven thousand, six hundred one".