661361351 has 8 divisors (see below), whose sum is σ = 756887040. Its totient is φ = 566097048.

The previous prime is 661361341. The next prime is 661361357. The reversal of 661361351 is 153163166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 661361351 - 2⁶ = 661361287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661361357) 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 7 ways as a sum of consecutive naturals, for example, 59891 + ... + 70068.

It is an arithmetic number, because the mean of its divisors is an integer number (94610880).

Almost surely, 2^661361351 is an apocalyptic number.

661361351 is a deficient number, since it is larger than the sum of its proper divisors (95525689).

661361351 is a wasteful number, since it uses less digits than its factorization.

661361351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130693.

The product of its digits is 9720, while the sum is 32.

The square root of 661361351 is about 25716.9467666751. The cubic root of 661361351 is about 871.2569803211.

The spelling of 661361351 in words is "six hundred sixty-one million, three hundred sixty-one thousand, three hundred fifty-one".