660661237 has 4 divisors (see below), whose sum is σ = 662813536. Its totient is φ = 658508940.

The previous prime is 660661231. The next prime is 660661241. The reversal of 660661237 is 732166066.

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 660661237 - 2¹⁵ = 660628469 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 660661196 and 660661205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660661231) 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 3 ways as a sum of consecutive naturals, for example, 1075689 + ... + 1076302.

It is an arithmetic number, because the mean of its divisors is an integer number (165703384).

Almost surely, 2^660661237 is an apocalyptic number.

It is an amenable number.

660661237 is a deficient number, since it is larger than the sum of its proper divisors (2152299).

660661237 is a wasteful number, since it uses less digits than its factorization.

660661237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2152298.

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 660661237 is about 25703.3312432455. The cubic root of 660661237 is about 870.9494356001.

The spelling of 660661237 in words is "six hundred sixty million, six hundred sixty-one thousand, two hundred thirty-seven".