661395349 has 4 divisors (see below), whose sum is σ = 661462636. Its totient is φ = 661328064.

The previous prime is 661395331. The next prime is 661395359. The reversal of 661395349 is 943593166.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 369600625 + 291794724 = 19225^2 + 17082^2 .

It is a cyclic number.

It is not a de Polignac number, because 661395349 - 2¹¹ = 661393301 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 661395299 and 661395308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661395359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15714 + ... + 39619.

It is an arithmetic number, because the mean of its divisors is an integer number (165365659).

Almost surely, 2^661395349 is an apocalyptic number.

It is an amenable number.

661395349 is a deficient number, since it is larger than the sum of its proper divisors (67287).

661395349 is a wasteful number, since it uses less digits than its factorization.

661395349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67286.

The product of its digits is 524880, while the sum is 46.

The square root of 661395349 is about 25717.6077619984. The cubic root of 661395349 is about 871.2719093697.

The spelling of 661395349 in words is "six hundred sixty-one million, three hundred ninety-five thousand, three hundred forty-nine".