720661351 has 2 divisors, whose sum is σ = 720661352. Its totient is φ = 720661350.

The previous prime is 720661343. The next prime is 720661423. The reversal of 720661351 is 153166027.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 720661351 - 2³ = 720661343 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720661301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360330675 + 360330676.

It is an arithmetic number, because the mean of its divisors is an integer number (360330676).

Almost surely, 2^720661351 is an apocalyptic number.

720661351 is a deficient number, since it is larger than the sum of its proper divisors (1).

720661351 is an equidigital number, since it uses as much as digits as its factorization.

720661351 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 720661351 is about 26845.1364496439. The cubic root of 720661351 is about 896.5552895447. Note that the first 3 decimals are identical.

The spelling of 720661351 in words is "seven hundred twenty million, six hundred sixty-one thousand, three hundred fifty-one".