661673351 has 2 divisors, whose sum is σ = 661673352. Its totient is φ = 661673350.

The previous prime is 661673333. The next prime is 661673357. The reversal of 661673351 is 153376166.

661673351 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-661673351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661673357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330836675 + 330836676.

It is an arithmetic number, because the mean of its divisors is an integer number (330836676).

Almost surely, 2^661673351 is an apocalyptic number.

661673351 is a deficient number, since it is larger than the sum of its proper divisors (1).

661673351 is an equidigital number, since it uses as much as digits as its factorization.

661673351 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 38.

The square root of 661673351 is about 25723.0120903443. The cubic root of 661673351 is about 871.3939651644.

The spelling of 661673351 in words is "six hundred sixty-one million, six hundred seventy-three thousand, three hundred fifty-one".