661180337 has 4 divisors (see below), whose sum is σ = 700073316. Its totient is φ = 622287360.

The previous prime is 661180319. The next prime is 661180339. The reversal of 661180337 is 733081166.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 733081166 = 2 ⋅366540583.

It can be written as a sum of positive squares in 2 ways, for example, as 608312896 + 52867441 = 24664^2 + 7271^2 .

It is a cyclic number.

It is not a de Polignac number, because 661180337 - 2⁸ = 661180081 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 661180297 and 661180306.

It is not an unprimeable number, because it can be changed into a prime (661180339) 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, 19446464 + ... + 19446497.

It is an arithmetic number, because the mean of its divisors is an integer number (175018329).

Almost surely, 2^661180337 is an apocalyptic number.

It is an amenable number.

661180337 is a deficient number, since it is larger than the sum of its proper divisors (38892979).

661180337 is a wasteful number, since it uses less digits than its factorization.

661180337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38892978.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 661180337 is about 25713.4271733661. The cubic root of 661180337 is about 871.1774856539.

The spelling of 661180337 in words is "six hundred sixty-one million, one hundred eighty thousand, three hundred thirty-seven".