721669007 has 2 divisors, whose sum is σ = 721669008. Its totient is φ = 721669006.

The previous prime is 721668949. The next prime is 721669019. The reversal of 721669007 is 700966127.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-721669007 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 (721669087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360834503 + 360834504.

It is an arithmetic number, because the mean of its divisors is an integer number (360834504).

Almost surely, 2^721669007 is an apocalyptic number.

721669007 is a deficient number, since it is larger than the sum of its proper divisors (1).

721669007 is an equidigital number, since it uses as much as digits as its factorization.

721669007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 721669007 is about 26863.8978370601. The cubic root of 721669007 is about 896.9729607932.

The spelling of 721669007 in words is "seven hundred twenty-one million, six hundred sixty-nine thousand, seven".