699609724321 has 2 divisors, whose sum is σ = 699609724322. Its totient is φ = 699609724320.

The previous prime is 699609724259. The next prime is 699609724343. The reversal of 699609724321 is 123427906996.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 686138872225 + 13470852096 = 828335^2 + 116064^2 .

It is a cyclic number.

It is not a de Polignac number, because 699609724321 - 2⁷ = 699609724193 is a prime.

It is a super-2 number, since 2×699609724321² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (699609724351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349804862160 + 349804862161.

It is an arithmetic number, because the mean of its divisors is an integer number (349804862161).

Almost surely, 2^699609724321 is an apocalyptic number.

It is an amenable number.

699609724321 is a deficient number, since it is larger than the sum of its proper divisors (1).

699609724321 is an equidigital number, since it uses as much as digits as its factorization.

699609724321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8817984, while the sum is 58.

The spelling of 699609724321 in words is "six hundred ninety-nine billion, six hundred nine million, seven hundred twenty-four thousand, three hundred twenty-one".