661313461 has 4 divisors (see below), whose sum is σ = 663040512. Its totient is φ = 659586412.

The previous prime is 661313431. The next prime is 661313467. The reversal of 661313461 is 164313166.

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 a de Polignac number, because none of the positive numbers 2^k-661313461 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 (661313467) 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, 862951 + ... + 863716.

It is an arithmetic number, because the mean of its divisors is an integer number (165760128).

Almost surely, 2^661313461 is an apocalyptic number.

It is an amenable number.

661313461 is a deficient number, since it is larger than the sum of its proper divisors (1727051).

661313461 is a wasteful number, since it uses less digits than its factorization.

661313461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1727050.

The product of its digits is 7776, while the sum is 31.

The square root of 661313461 is about 25716.0156517296. The cubic root of 661313461 is about 871.2359502121.

The spelling of 661313461 in words is "six hundred sixty-one million, three hundred thirteen thousand, four hundred sixty-one".